55,000,000 AGGREGATE PRINCIPAL AMOUNT Salix Pharmaceuticals, Ltd. 5.5% CONVERTIBLE SENIOR NOTES DUE 2028 Purchase Agreement dated August 18, 2008

Exhibit 1.1

$55,000,000 AGGREGATE PRINCIPAL AMOUNT

Salix Pharmaceuticals, Ltd.

5.5% CONVERTIBLE SENIOR NOTES

DUE 2028

Purchase Agreement

dated August 18, 2008

Purchase Agreement

August 18, 0000

XXXX XX XXXXXXX SECURITIES LLC

Xxx Xxxxxx Xxxx

Xxx Xxxx, Xxx Xxxx 00000

As Representative of the several Initial Purchasers

Ladies and Gentlemen:

Salix Pharmaceuticals, Ltd., a Delaware corporation (the “Company”), proposes to issue and sell to the several purchasers named in Schedule A (the “Initial Purchasers”) $55,000,000 in aggregate principal amount of its 5.5% Convertible Senior Notes due 2028 (the “Firm Notes”). In addition, the Company has granted to the Initial Purchasers an option to purchase up to an additional $5,000,000 in aggregate principal amount of its 5.5% Convertible Senior Notes due 2028 (the “Optional Notes” and, together with the Firm Notes, the “Notes”), as provided in Section 2. Banc of America Securities LLC (“BAS”) has agreed to act as representative of the several Initial Purchasers (in such capacity, the “Representative”) in connection with the offering and sale of the Notes.

The Notes will be convertible on the terms, and subject to the conditions, set forth in the indenture (the “Indenture”) to be entered into between the Company and U.S. Bank National Association, as trustee (the “Trustee”), on the Closing Date (as defined herein). As used herein, “Conversion Shares” means the fully paid, nonassessable shares of common stock, par value $0.001 per share, of the Company (the “Common Stock”) to be received by the holders of the Notes upon conversion of the Notes pursuant to the terms of the Notes and the Indenture. The Notes will be convertible initially at a conversion rate of 108.0847 shares per $1,000 principal amount of the Notes, on the terms, and subject to the conditions, set forth in the Indenture.

The Notes will be offered and sold to the Initial Purchasers without being registered under the Securities Act of 1933, as amended, and the rules and regulations of the Securities and Exchange Commission (the “Commission”) thereunder (the “Securities Act”), in reliance upon an exemption therefrom.

This Agreement, the Indenture and the Notes are referred to herein collectively as the “Operative Documents.”

The Company understands that the Initial Purchasers propose to make an offering of the Notes on the terms and in the manner set forth herein and in the Disclosure Package (as defined below), including the Preliminary Offering Memorandum (as defined below), and the Final Offering Memorandum (as defined below) and agrees that the Initial Purchasers may resell, subject to the conditions set forth herein, all or a portion of the Notes to purchasers at any time after the date of this Agreement.

The Company has prepared an offering memorandum, dated the date hereof, setting forth information concerning the Company, the Notes and the Common Stock, in form and substance reasonably satisfactory to the Initial Purchasers. As used in this Agreement, “Offering Memorandum” means, collectively, the Preliminary Offering Memorandum dated as of August 18, 2008 (the “Preliminary Offering Memorandum”) and the offering memorandum dated the date hereof (the “Final Offering Memorandum”), each as then amended or supplemented by the Company. As used herein, each of the terms “Disclosure Package,” “Offering Memorandum,” “Preliminary Offering Memorandum” and “Final Offering Memorandum” shall include in each case the documents incorporated or deemed to be incorporated by reference therein.

The Company hereby confirms its agreements with the Initial Purchasers as follows:

Section 1. Representations, Warranties and Covenants of the Company.

The Company hereby represents and warrants to, and covenants with, each Initial Purchaser as follows:

(a) No Registration. Assuming the accuracy of the representations and warranties of the Initial Purchasers contained in Section 6 and their compliance with the agreements set forth therein, it is not necessary, in connection with the issuance and sale of the Notes to the Initial Purchasers, the offer, resale and delivery of the Notes by the Initial Purchasers and the conversion of the Notes into Conversion Shares, in each case in the manner contemplated by this Agreement, the Indenture, the Disclosure Package and the Offering Memorandum, to register the Notes or the Conversion Shares under the Securities Act or to qualify the Indenture under the Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”).

(b) No Integration. None of the Company or any of its subsidiaries has, directly or through any agent, sold, offered for sale, solicited offers to buy or otherwise negotiated in respect of, any “security” (as defined in the Securities Act) that is or will be integrated with the sale of the Notes or the Conversion Shares in a manner that would require registration under the Securities Act of the Notes or the Conversion Shares.

(c) Rule 144A. No securities of the same class (within the meaning of Rule 144A(d)(3) under the Securities Act) as the Notes are listed on any national securities exchange registered under Section 6 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or quoted on an automated inter-dealer quotation system.

(d) Exclusive Agreement. The Company has not paid or agreed to pay to any person any compensation for soliciting another person to purchase any securities of the Company (except as contemplated in this Agreement).

(e) Offering Memoranda. The Company hereby confirms that it has authorized the use of the Disclosure Package, including the Preliminary Offering Memorandum, and the Final Offering Memorandum in connection with the offer and sale of the Notes by the Initial Purchasers. Each document, if any, filed or to be filed pursuant to the Exchange Act and incorporated by reference in the Disclosure Package or the Final Offering Memorandum complied when it was filed, or will comply when it is filed, as the case may be, in all material respects with the Exchange Act and the rules and regulations of the Commission thereunder. The Preliminary Offering Memorandum, at the date thereof, did not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. At the date of this

Agreement, the Closing Date and on any Subsequent Closing Date, the Final Offering Memorandum did not and will not (and any amendment or supplement thereto, at the date thereof, at the Closing Date and on any Subsequent Closing Date, will not) contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the Company makes no representation or warranty as to information contained in or omitted from the Preliminary Offering Memorandum or the Final Offering Memorandum in reliance upon and in conformity with written information furnished to the Company by any Initial Purchaser through BAS expressly for use therein, it being understood and agreed that the only such information furnished by any Initial Purchaser consists of the information described as such in Section 8 hereof.

(f) Disclosure Package. The term “Disclosure Package” shall mean (i) the Preliminary Offering Memorandum, as amended or supplemented at the Applicable Time, (ii) the Final Term Sheet (as defined herein) and (iii) any other writings that the parties expressly agree in writing to treat as part of the Disclosure Package (“Issuer Written Information”). As of 7:30 p.m., New York time, on the date of execution and delivery of this Agreement (the “Applicable Time”), the Disclosure Package did not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The preceding sentence does not apply to statements in or omissions from the Disclosure Package based upon and in conformity with written information furnished to the Company by any Initial Purchaser through BAS expressly for use therein, it being understood and agreed that the only such information furnished by any Initial Purchaser consists of the information described as such in Section 8 hereof.

(g) Statements in Offering Memorandum. The statements in the Disclosure Package and the Final Offering Memorandum under the headings “Description of Notes” and “Certain United States Federal Income Tax Considerations” and in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007 under the headings, “Business – Patents and Proprietary Rights,” “Business – Government Regulation” and “Risk Factors – Regulatory approval of our product candidates is time-consuming, expensive and uncertain, and could result in unexpectedly high expenses and delay our ability to sell our products,” “Risk Factors – Regulatory approval, even if granted, might entail ongoing requirements or restrictions on marketing that could increase our expenses and limit revenue,” “Risk Factors – Failure to comply with manufacturing regulation could harm us financially and could hurt our reputation,” “Risk Factors – Our intellectual property rights might not afford us with meaningful protection,” “Risk Factors – We could be exposed to significant product liability claims that could prevent or interfere with our product commercialization efforts” and “Legal Proceedings” incorporated by reference in the Disclosure Package and the Final Offering Memorandum insofar as such statements summarize legal matters, agreements, documents or proceedings discussed therein, are accurate and fair summaries of such legal matters, agreements, documents or proceedings.

(h) Offering Materials Furnished to Initial Purchasers. The Company has delivered to the Representative copies of the materials contained in the Disclosure Package and the Final Offering Memorandum, each as amended or supplemented, in such quantities and at such places as the Representative has reasonably requested for each of the Initial Purchasers.

(i) Authorization of the Purchase Agreement. This Agreement has been duly authorized, executed and delivered by the Company.

(j) Authorization of the Indenture. The Indenture has been duly authorized by the Company; on the Closing Date, the Indenture will have been duly executed and delivered by the Company and, assuming due authorization, execution and delivery thereof by the Trustee, will constitute a legally valid and binding agreement of the Company enforceable against the Company in accordance with its terms, except as enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles; and the Indenture conforms in all material respects to the description thereof contained in the Disclosure Package and the Final Offering Memorandum.

(k) Authorization of the Notes. The Notes have been duly authorized by the Company; when the Notes are executed, authenticated and issued in accordance with the terms of the Indenture and delivered to and paid for by the Initial Purchasers pursuant to this Agreement on the Closing Date and any Subsequent Closing Date (assuming due authentication of the Notes by the Trustee), such Notes will constitute legally valid and binding obligations of the Company, entitled to the benefits of the Indenture and enforceable against the Company in accordance with their terms, except as enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles; and the Notes will conform in all material respects to the description thereof contained in the Disclosure Package and the Final Offering Memorandum.

(l) Authorization of the Conversion Shares. The Conversion Shares have been duly authorized and reserved and, when issued upon conversion of the Notes in accordance with the terms of the Notes and the Indenture, will be validly issued, fully paid and nonassessable, and the issuance of such shares will not be subject to any preemptive or similar rights.

(m) No Material Adverse Change. Except as otherwise disclosed in the Disclosure Package and the Final Offering Memorandum (exclusive of any amendments or supplements thereto subsequent to the date of this Agreement), subsequent to the respective dates as of which information is given in the Disclosure Package: (i) there has been no material adverse change, or any development that could reasonably be expected to result in a material adverse change, in the condition, financial or otherwise, or in the earnings, business, properties, operations or prospects, whether or not arising from transactions in the ordinary course of business, of the Company and its subsidiaries, considered as one entity (any such change is called a “Material Adverse Change”); (ii) the Company and its subsidiaries, considered as one entity, have not incurred any material liability or obligation, indirect, direct or contingent, nor entered into any material transaction or agreement; and (iii) there has been no dividend or distribution of any kind declared, paid or made by the Company or, except for dividends paid to the Company or other subsidiaries, any of its subsidiaries on any class of capital stock or repurchase or redemption by the Company or any of its subsidiaries of any class of capital stock (other than potential forfeitures of unvested restricted stock, for which no consideration is paid by the Company, by holders thereof whose relationship with the Company is terminated).

(n) Independent Accountants. PricewaterhouseCoopers LLP and Ernst & Young LLP, who have expressed their opinion with respect to the financial statements (which term as used in this Agreement includes the related notes thereto) and supporting schedules included as a part of or incorporated by reference in the Disclosure Package and the Final Offering Memorandum, are (in the case of Pricewaterhouse Coopers LLP) and were (in the case of Ernst & Young LLP) independent registered public accountants with respect to the Company as required by the

Securities Act and the Exchange Act and the applicable published rules and regulations thereunder.

(o) Preparation of the Financial Statements. The financial statements and the supporting schedules included or incorporated by reference in the Disclosure Package and the Final Offering Memorandum present fairly the consolidated financial position of the Company and its consolidated subsidiaries as of and at the dates indicated and the results of their operations and cash flows for the periods specified. Such financial statements and supporting schedules comply as to form with the applicable accounting requirements of Regulation S-X and have been prepared in conformity with generally accepted accounting principles as applied in the United States (“GAAP”) applied on a consistent basis throughout the periods involved, except as may be expressly stated in the related notes thereto. The financial data set forth in the Disclosure Package and the Final Offering Memorandum under the captions “Offering Memorandum Summary—Summary Selected Financial Data” and “Capitalization” fairly present the information set forth therein on a basis consistent with that of the audited financial statements contained in the Disclosure Package and the Final Offering Memorandum.

(p) Incorporation and Good Standing of the Company and its Subsidiaries. Each of the Company and its subsidiaries has been duly incorporated and is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation and has corporate power and authority to own or lease, as the case may be, and operate its properties and to conduct its business as described in the Disclosure Package and the Final Offering Memorandum and, in the case of the Company, to enter into and perform its obligations under this Agreement. The Company and each of its subsidiaries is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except for such jurisdictions where the failure to so qualify or to be in good standing would not, individually or in the aggregate, result in a material adverse effect on the condition, financial or otherwise, or on the earnings, business, properties, operations or prospects, whether or not arising from transactions in the ordinary course of business, of the Company and its subsidiaries, considered as one entity (a “Material Adverse Effect”). All of the issued and outstanding shares of capital stock of each subsidiary have been duly authorized and validly issued, are fully paid and nonassessable and are owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance or claim. The Company does not own or control, directly or indirectly, any corporation, association or other entity other than the subsidiaries listed in Exhibit 21.1 to the Company’s Amended Annual Report on Form 10-K for the fiscal year ended December 31, 2007, as filed with the Commission on March 18, 2008.

(q) Capitalization and Other Capital Stock Matters. The authorized, issued and outstanding capital stock of the Company is as set forth in the Disclosure Package and the Final Offering Memorandum under the caption “Capitalization” (other than for subsequent issuances, if any, pursuant to employee benefit plans described in the Disclosure Package and the Final Offering Memorandum or upon exercise of outstanding options or warrants described in the Disclosure Package and the Final Offering Memorandum, as the case may be). The Common Stock (including the Conversion Shares) conforms in all material respects to the description thereof contained in the Disclosure Package and the Final Offering Memorandum. All of the issued and outstanding shares of Common Stock have been duly authorized and validly issued, are fully paid and nonassessable and have been issued in compliance with federal and state securities laws. None of the outstanding shares of Common Stock were issued in violation of any preemptive rights, rights of first refusal or other similar rights to subscribe for or purchase

securities of the Company. There are no authorized or outstanding options, warrants, preemptive rights, rights of first refusal or other rights to purchase, or equity or debt securities convertible into or exchangeable or exercisable for, any capital stock of the Company or any of its subsidiaries other than those accurately described in the Disclosure Package and the Final Offering Memorandum. The description of the Company’s stock option, stock bonus and other stock plans or arrangements, and the options or other rights granted thereunder, set forth or incorporated by reference in the Disclosure Package and the Final Offering Memorandum accurately and fairly presents and summarizes such plans, arrangements, options and rights.

(r) Non-Contravention of Existing Instruments; No Further Authorizations or Approvals Required. Neither the Company nor any of its subsidiaries is (i) in violation or in default (or, with the giving of notice or lapse of time, would be in default) (“Default”) under its charter or by-laws, (ii) in Default under any indenture, mortgage, loan or credit agreement, deed of trust, note, contract, franchise, lease or other agreement, obligation, condition, covenant or instrument to which the Company or such subsidiary is a party or by which it may be bound (including, without limitation, the Company’s Credit Agreement, originally dated as of February 22, 2007, by and among the Company, Bank of America, N.A. and the other parties thereto, and as further amended by the first amendment thereto, dated as of August 4, 2008 (the “Credit Agreement”)), or to which any of the property or assets of the Company or any of its subsidiaries is subject (each, an “Existing Instrument”) or (iii) in violation of any statute, law, rule, regulation, judgment, order or decree of any court, regulatory body, administrative agency, governmental body, arbitrator or other authority having jurisdiction over the Company or such subsidiary or any of its properties, as applicable, except with respect to clauses (ii) and (iii) only, for such Defaults as would not, individually or in the aggregate, have a Material Adverse Effect.

The Company’s execution, delivery and performance of the Operative Documents and consummation of the transactions contemplated thereby, by the Disclosure Package and by the Final Offering Memorandum (i) have been duly authorized by all necessary corporate action and will not result in any Default under the charter or by-laws of the Company or any subsidiary, (ii) will not conflict with or constitute a breach of, or Default under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to, or require the consent of any other party to, any Existing Instrument and (iii) will not result in any violation of any statute, law, rule, regulation, judgment, order or decree applicable to the Company or any of its subsidiaries of any court, regulatory body, administrative agency, governmental body, arbitrator or other authority having jurisdiction over the Company or any of its subsidiaries or any of its or their properties, except with respect to clauses (ii) and (iii) only, for such conflicts, breaches, creations, impositions, charges, encumbrances, consents or violations as would not, individually or in the aggregate, have a Material Adverse Effect.

No consent, approval, authorization or other order of, or registration or filing with, any court or other governmental or regulatory authority or agency is required for the Company’s execution, delivery and performance of the Operative Documents and consummation of the transactions contemplated thereby, by the Disclosure Package and by the Final Offering Memorandum, except such as have been obtained or made by the Company and as may be required to be obtained or made under applicable state securities or blue sky laws and from the Nasdaq Global Market in connection with approval of the Conversion Shares for listing, subject to issuance.

(s) No Stamp or Transfer Taxes. There are no stamp or other issuance or transfer taxes or duties or other similar fees or charges under federal law or the laws of any state, or any

political subdivision thereof, or any other U.S. or non-U.S. governmental authority required to be paid in connection with the execution and delivery of this Agreement or the issuance or sale by the Company of the Notes or upon the issuance of Common Stock upon the conversion thereof.

(t) No Material Actions or Proceedings. There are no legal or governmental actions, suits or proceedings pending or, to the Company’s knowledge, threatened against or affecting the Company or any of its subsidiaries, (i) that has as the subject thereof any officer or director of, or property owned or leased by, the Company or any of its subsidiaries or (ii) relating to environmental or discrimination matters, where in either such case, (A) there is a reasonable possibility that such action, suit or proceeding might be determined adversely to the Company or such subsidiary, or any officer or director of, or property owned or leased by, the Company or any of its subsidiaries and (B) any such action, suit or proceeding, if so determined adversely, would reasonably be expected to have a Material Adverse Effect or adversely affect the consummation of the transactions contemplated by this Agreement.

(u) Labor Matters. No labor problem or dispute with the employees of the Company or any of its subsidiaries exists or is threatened or imminent, and the Company is not aware of any existing, threatened or imminent labor disturbance by the employees of any of its or its subsidiaries’ principal suppliers, contractors or customers, that could have a Material Adverse Effect.

(v) Intellectual Property Rights. The Company and its subsidiaries own, possess, license or have other rights to use, on reasonable terms, all patents, patent applications, trade and service marks, trade and service xxxx registrations, trade names, copyrights, licenses, inventions, trade secrets, technology, know-how and other intellectual property (collectively, the “Intellectual Property”) necessary for the conduct of the business of the Company and its subsidiaries as now conducted or as proposed in the Disclosure Package and the Final Offering Memorandum to be conducted. Except as set forth in the Disclosure Package and the Final Offering Memorandum, (a) no party has been granted an exclusive license to use any portion of such Intellectual Property owned by the Company or any of its subsidiaries; (b) to the Company’s knowledge, there is no material infringement by third parties of any such Intellectual Property owned by or exclusively licensed to the Company or any of its subsidiaries; (c) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by others challenging the rights of the Company or any of its subsidiaries in or to any such Intellectual Property, and the Company is unaware of any facts that would form a reasonable basis for any such claim; (d) to the Company’s knowledge, there is no pending or threatened action, suit, proceeding or claim by others challenging the validity or scope of any such Intellectual Property, and the Company is unaware of any facts that would form a reasonable basis for any such claim; and (e) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by others that the business of the Company or any of its subsidiaries as now conducted infringes or otherwise violates any patent, trademark, copyright, trade secret or other proprietary rights of others, and the Company is unaware of any other fact that would form a reasonable basis for any such claim.

(w) All Necessary Permits, etc. The Company and each subsidiary possess such valid and current licenses, certificates, authorizations or permits issued by the appropriate state, federal or foreign regulatory agencies or bodies necessary to conduct their respective businesses, and neither the Company nor any subsidiary has received any notice of proceedings relating to the revocation or modification of, or non-compliance with, any such license, certificate, authorization or permit which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, could have a Material Adverse Effect.

(x) Title to Properties. The Company and each of its subsidiaries has good and marketable title to all the properties and assets reflected as owned in the financial statements referred to in Section 1(o) above or elsewhere in the Disclosure Package and the Final Offering Memorandum, in each case free and clear of any security interests, mortgages, liens, encumbrances, equities, claims and other defects, except such as do not materially and adversely affect the value of such property and do not materially interfere with the use made or proposed to be made of such property by the Company or such subsidiary and except as otherwise disclosed in the Disclosure Package and the Final Offering Memorandum. The real property, improvements, equipment and personal property held under lease by the Company or any subsidiary are held under valid and enforceable leases, with such exceptions as are not material and do not materially interfere with the use made or proposed to be made of such real property, improvements, equipment or personal property by the Company or such subsidiary.

(y) Tax Law Compliance. The Company and its subsidiaries have filed all necessary federal, state, local and foreign income and franchise tax returns in a timely manner and have paid all taxes required to be paid by any of them and, if due and payable, any related or similar assessment, fine or penalty levied against any of them, except for any taxes, assessments, fines or penalties as may be being contested in good faith and by appropriate proceedings. The Company has made appropriate provisions in the financial statements referred to in Section 1(o) above in respect of all federal, state, local and foreign income and franchise taxes for all current or prior periods as to which the tax liability of the Company or any of its subsidiaries has not been finally determined.

(z) Company Not an “Investment Company.” The Company has been advised of the rules and requirements under the Investment Company Act of 1940, as amended, and the rules and regulations promulgated thereunder (the “Investment Company Act”). The Company is not, and after receipt of payment for the Notes and the application of the proceeds thereof as contemplated under the caption “Use of Proceeds” in the Disclosure Package and the Final Offering Memorandum will not be, an “investment company” within the meaning of the Investment Company Act and will conduct its business in a manner so that it will not become subject to the Investment Company Act.

(aa) Compliance with Reporting Requirements. The Company is subject to and in full compliance with the reporting requirements of Section 13 or Section 15(d) of the Exchange Act.

(bb) Insurance. The Company and its subsidiaries are insured by recognized, financially sound and reputable institutions with policies in such amounts and with such deductibles and covering such risks as are generally deemed adequate and customary for their businesses including, but not limited to, policies covering real and personal property owned or leased by the Company and its subsidiaries against theft, damage, destruction and acts of terrorism or vandalism. All policies of insurance and fidelity or surety bonds insuring the Company or any of its subsidiaries or their respective businesses, assets, employees, officers and directors are in full force and effect; the Company and its subsidiaries are in compliance with the terms of such policies and instruments in all material respects; and there are no claims by the Company or any of its subsidiaries under any such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause; and neither the Company nor any such subsidiary has been refused any insurance coverage sought or applied for. The Company has no reason to believe that it or any subsidiary will not be able (i) to renew its existing insurance coverage as and when such policies expire or (ii) to obtain comparable coverage from similar institutions as may be necessary or appropriate to conduct its business as now conducted and at a cost that would not have a Material Adverse Effect.

(cc) No Restriction on Dividends or other Distributions. No subsidiary of the Company is currently prohibited, directly or indirectly, from paying any dividends or other distributions to the Company, from making any other distribution on such subsidiary’s capital stock, from repaying to the Company any loans or advances to such subsidiary from the Company or from transferring any of such subsidiary’s property or assets to the Company or any other subsidiary of the Company, except as described in or contemplated by the Disclosure Package and the Final Offering Memorandum.

(dd) No Price Stabilization or Manipulation. The Company has not taken and will not take, directly or indirectly, any action designed to or that might be reasonably expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Notes. The Company acknowledges that the Initial Purchasers may engage in passive market making transactions in the Common Stock on the Nasdaq Global Market in accordance with Regulation M under the Exchange Act.

(ee) Related Party Transactions. There are no material business relationships or related-party transactions involving the Company or any subsidiary or any other person that have not been described in the Disclosure Package or the Final Offering Memorandum.

(ff) No General Solicitation. None of the Company or any of its affiliates (as defined in Rule 501(b) of Regulation D under the Securities Act (“Regulation D”)), has, directly or through an agent, engaged in any form of general solicitation or general advertising in connection with the offering of the Notes or the Conversion Shares (as those terms are used in Regulation D) under the Securities Act or in any manner involving a public offering within the meaning of Section 4(2) of the Securities Act; the Company has not entered into any contractual arrangement with respect to the distribution of the Notes or the Conversion Shares except for this Agreement; and the Company will not enter into any such arrangement.

(gg) No Unlawful Contributions or Other Payments. Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is aware of or has taken any action, directly or indirectly, that would result in a violation by such persons of the FCPA, including, without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other property, gift, promise to give, or authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign political party or official thereof or any candidate for foreign political office, in contravention of the FCPA and the Company, its subsidiaries and, to the knowledge of the Company, its affiliates have conducted their businesses in compliance with the FCPA and have instituted and maintain policies and procedures designed to ensure, and which are reasonably expected to continue to ensure, continued compliance therewith.

“FCPA” means the Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder.

(hh) No Conflict with Money Laundering Laws. The operations of the Company and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all applicable jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines issued, administered or enforced by any governmental agency (collectively, the “Money Laundering

Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

(ii) No Conflict with OFAC Laws. Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”); and the Company will not directly or indirectly use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person currently subject to any U.S. sanctions administered by OFAC.

(jj) Compliance with Environmental Laws. Except as otherwise disclosed in the Disclosure Package and the Final Offering Memorandum, (i) neither the Company nor any of its subsidiaries is in violation of any federal, state, local or foreign law, regulation, order, permit or other requirement relating to pollution or protection of human health or the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including without limitation, laws and regulations relating to emissions, discharges, releases or threatened releases of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum and petroleum products (collectively, “Materials of Environmental Concern”), or otherwise relating to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Materials of Environmental Concern (collectively, “Environmental Laws”), which violation includes, but is not limited to, noncompliance with any permits or other governmental authorizations required for the operation of the business of the Company or its subsidiaries under applicable Environmental Laws, or noncompliance with the terms and conditions thereof, nor has the Company or any of its subsidiaries received any written communication, whether from a governmental authority, citizens group, employee or otherwise, that alleges that the Company or any of its subsidiaries is in violation of any Environmental Law, except as would not, individually or in the aggregate, have a Material Adverse Effect; (ii) there is no claim, action or cause of action filed with a court or governmental authority, no investigation with respect to which the Company has received written notice, and no written notice by any person or entity alleging potential liability for investigatory costs, cleanup costs, governmental responses costs, natural resources damages, property damages, personal injuries, attorneys’ fees or penalties arising out of, based on or resulting from the presence, or release into the environment, of any Material of Environmental Concern at any location owned, leased or operated by the Company or any of its subsidiaries, now or in the past (collectively, “Environmental Claims”), pending or, to the Company’s knowledge, threatened against the Company or any of its subsidiaries or any person or entity whose liability for any Environmental Claim the Company or any of its subsidiaries has retained or assumed either contractually or by operation of law, except as would not, individually or in the aggregate, have a Material Adverse Effect; (iii) to the Company’s knowledge, there are no past, present or anticipated future actions, activities, circumstances, conditions, events or incidents, including, without limitation, the release, emission, discharge, presence or disposal of any Material of Environmental Concern, that reasonably could result in a violation of any Environmental Law, require expenditures to be incurred pursuant to Environmental Law, or form the basis of a potential Environmental Claim against the Company or any of its subsidiaries or against any person or entity whose liability for any Environmental Claim the Company or any of its subsidiaries has retained or assumed either contractually or by operation of law, except as would not, individually or in the aggregate, have a Material Adverse Effect; and (iv) neither the

Company nor any of its subsidiaries is subject to any pending or threatened proceeding under Environmental Law to which a governmental authority is a party and which is reasonably likely to result in monetary sanctions of $100,000 or more.

(kk) ERISA Compliance. None of the following events has occurred or exists: (i) a failure to fulfill the obligations, if any, under the minimum funding standards of Xxxxxxx 000 xx xxx Xxxxxx Xxxxxx Employee Retirement Income Security Act of 1974, as amended (“ERISA”), and the regulations and published interpretations thereunder with respect to a Plan, determined without regard to any waiver of such obligations or extension of any amortization period; (ii) an audit or investigation by the Internal Revenue Service, the U.S. Department of Labor, the Pension Benefit Guaranty Corporation or any other federal or state governmental agency or any foreign regulatory agency with respect to the employment or compensation of employees by the Company or any of its subsidiaries that could have a Material Adverse Effect; (iii) any breach of any contractual obligation, or any violation of law or applicable qualification standards, with respect to the employment or compensation of employees by the Company or any of its subsidiaries that could have a Material Adverse Effect. None of the following events has occurred or is reasonably likely to occur: (A) a material increase in the aggregate amount of contributions required to be made to all Plans in the current fiscal year of the Company and its subsidiaries compared to the amount of such contributions made in the Company and its subsidiaries’ most recently completed fiscal year; (B) a material increase in the Company and its subsidiaries’ “accumulated post-retirement benefit obligations” (within the meaning of Statement of Financial Accounting Standards 106) compared to the amount of such obligations in the Company and its subsidiaries’ most recently completed fiscal year; (C) any event or condition giving rise to a liability under Title IV of ERISA that could have a Material Adverse Effect; or (D) the filing of a claim by one or more employees or former employees of the Company or any of its subsidiaries related to its or their employment that could have a Material Adverse Effect. For purposes of this paragraph, the term “Plan” means a plan (within the meaning of Section 3(3) of ERISA) subject to Title IV of ERISA with respect to which the Company or any of its subsidiaries may have any liability.

(ll) Brokers. Except as otherwise disclosed in the Disclosure Package and the Final Offering Memorandum, there is no broker, finder or other party that is entitled to receive from the Company any brokerage or finder’s fee or other fee or commission as a result of any transactions contemplated by this Agreement.

(mm) No Outstanding Loans or Other Indebtedness. There are no outstanding loans, advances (except normal advances for business expenses in the ordinary course of business) or guarantees or indebtedness by the Company to or for the benefit of any of the officers or directors of the Company or any of the members of any of their families.

(nn) Xxxxxxxx-Xxxxx Compliance. There is and has been no failure on the part of the Company and any of the Company’s directors or officers, in their capacities as such, to comply in all material respects with any provision of the Xxxxxxxx-Xxxxx Act of 2002 and the rules and regulations promulgated in connection therewith (the “Xxxxxxxx-Xxxxx Act”), including Section 402 related to loans and Sections 302 and 906 related to certifications.

(oo) Internal Controls and Procedures. The Company maintains (i) effective internal control over financial reporting as defined in Rule 13a-15 under the Exchange Act and (ii) a system of internal accounting controls sufficient to provide reasonable assurance that (A) transactions are executed in accordance with management’s general or specific authorizations; (B) transactions are recorded as necessary to permit preparation of financial

statements in conformity with generally accepted accounting principles and to maintain asset accountability; (C) access to assets is permitted only in accordance with management’s general or specific authorization; and (D) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences.

(pp) No Material Weakness in Internal Controls. Except as disclosed in the Disclosure Package and the Final Offering Memorandum, since the end of the Company’s most recent audited fiscal year, there has been (i) no material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (ii) no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

(qq) Disclosure Controls. The Company and its subsidiaries maintain an effective system of “disclosure controls and procedures” (as defined in Rule 13a-15 of the Exchange Act) that is designed to ensure that information required to be disclosed by the Company in reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Commission’s rules and forms, including controls and procedures designed to ensure that such information is accumulated and communicated to the Company’s management as appropriate to allow timely decisions regarding required disclosure. The Company and its subsidiaries have carried out evaluations of the effectiveness of their disclosure controls and procedures as required by Rule 13a-15 of the Exchange Act.

(rr) Stock Options. With respect to the stock options (the “Stock Options”) granted pursuant to the stock-based compensation plans of the Company and its subsidiaries (the “Company Stock Plans”), (i) each Stock Option designated by the Company or the relevant subsidiary of the Company at the time of grant as an “incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended, so qualifies, (ii) each grant of a Stock Option was duly authorized no later than the date on which the grant of such Stock Option was by its terms to be effective (the “Grant Date”) by all necessary corporate action, including, as applicable, approval by the board of directors of the Company or the relevant subsidiary of the Company (or a duly constituted and authorized committee thereof) and any required stockholder approval by the necessary number of votes or written consents, and the award agreement governing such grant (if any) was duly executed and delivered by each party thereto, (iii) each such grant was made in accordance with the terms of the Company Stock Plans, the Exchange Act and all other applicable laws and regulatory rules or requirements, including the rules of the Nasdaq Global Market and any other exchange on which the securities of the Company or the relevant subsidiary of the Company are traded, (iv) the per share exercise price of each Stock Option was equal to or greater than the fair market value of a share of Common Stock on the applicable Grant Date, and (v) each such grant was properly accounted for in accordance with GAAP in the consolidated financial statements (including the related notes) of the Company and disclosed in the Company’s filings with the Commission in accordance with the Exchange Act and all other applicable laws. Neither the Company nor any of its subsidiaries has knowingly granted, and there is no and has been no policy or practice of the Company or any of its subsidiaries of granting, Stock Options prior to, or otherwise coordinating the grant of Stock Options with, the release or other public announcement of material information regarding the Company or its subsidiaries or their results of operations or prospects.

(ss) Subsidiaries. The subsidiaries listed on Schedule D attached hereto are the only subsidiaries of the Company.

(tt) Lending Relationship. Except as disclosed in the Disclosure Package and the Final Offering Memorandum, the Company (i) does not have any material lending or other relationship with any bank or lending affiliate of any Initial Purchaser and (ii) does not intend to use any of the proceeds from the sale of the Notes hereunder to repay any outstanding debt owed to any affiliate of any Initial Purchaser.

(uu) PORTAL. The Company has been advised by NASDAQ’s PORTAL Market that the Notes have been designated PORTAL eligible securities in accordance with the rules and regulations of NASDAQ.

(vv) Product and Facility Approval. The U.S. Food and Drug Administration (the “FDA”) has not commenced, or, to the of the Company’s knowledge, threatened to initiate, any action to withdraw its clearance or approval of any product of the Company or commenced or, to the of the Company’s knowledge, threatened to initiate any action to withdraw its clearance or approval of any facility of the Company or any manufacturer of any previously cleared or approved product of the Company.

(ww) Studies, Tests and Trials. To the Company’s knowledge, the descriptions of the results of the studies, tests and trials contained in the Disclosure Package and the Final Offering Memorandum are accurate in all material respects; the Company has no knowledge of any other studies or tests, the results of which could reasonably be expected to discredit or call into question the results described in Disclosure Package and the Final Offering Memorandum; and the Company has not received any notice or correspondence from the FDA or any other governmental agency requiring the termination or suspension of any pre-clinical or clinical trials conducted by, or on behalf of, the Company or in which the Company has participated.

Any certificate signed by an officer of the Company and delivered to the Representative or to counsel for the Initial Purchasers shall be deemed to be a representation and warranty by the Company to each Initial Purchaser as to the matters set forth therein.

Section 2. Purchase, Sale and Delivery of the Notes

(a) The Firm Notes. The Company agrees to issue and sell to the several Initial Purchasers the Firm Notes upon the terms herein set forth. On the basis of the representations, warranties and agreements herein contained, and upon the terms but subject to the conditions herein set forth, the Initial Purchasers agree, severally and not jointly, to purchase from the Company the respective aggregate principal amount of Firm Notes set forth opposite their names on Schedule A. The purchase price per Firm Note to be paid by the several Initial Purchasers to the Company shall be 96.0% of the aggregate principal amount thereof.

(b) The Closing Date. Delivery of the Firm Notes to be purchased by the Initial Purchasers and payment therefor shall be made at the offices of Xxxxxx Xxxxxxxx Xxxxx & Xxxxxxxx LLP, Xxx Xxxxxxx Xxxxx, Xxx Xxxx, XX 00000 (or such other place as may be agreed to by the Company and BAS) at 9:00 a.m., New York time, on August 22, 2008, or such other time and date not later than 1:30 p.m., New York time, September 8, 2008 as BAS shall designate by notice to the Company (the time and date of such closing are called the “Closing Date”).

(c) The Optional Notes; any Subsequent Closing Date. In addition, on the basis of the representations, warranties and agreements herein contained, and upon the terms but subject to the conditions herein set forth, the Company hereby grants an option to the several Initial Purchasers to purchase, severally and not jointly, up to $5,000,000 aggregate principal amount of

Optional Notes from the Company at the same price as the purchase price per Firm Note to be paid by the Initial Purchasers for the Firm Notes. The option granted hereunder may be exercised only to cover over-allotments in the sale of the Firm Notes by the Initial Purchasers. The option may be exercised at any time and from time to time upon notice by BAS to the Company, which notice may be given at any time within 30 days from the date of this Agreement. Such notice shall set forth (i) the amount (which shall be an integral multiple of $1,000 in aggregate principal amount) of Optional Notes as to which the Initial Purchasers are exercising the option, (ii) the names and denominations in which the Optional Notes are to be registered and (iii) the time, date and place at which such Optional Notes will be delivered (which time and date may be simultaneous with, but not earlier than, the Closing Date; and in such case the term “Closing Date” shall refer to the time and date of delivery of the Firm Notes and the Optional Notes). Each time and date of delivery, if subsequent to the Closing Date, is called a “Subsequent Closing Date” and shall be determined by BAS and shall not be earlier than the Closing Date nor later than 10 business days after delivery of such notice of exercise. If any Optional Notes are to be purchased, each Initial Purchaser agrees, severally and not jointly, to purchase the aggregate principal amount of Optional Notes (subject to such adjustments to eliminate fractional amounts as BAS may determine) that bears the same proportion to the total aggregate principal amount of Optional Notes to be purchased as the aggregate principal amount of Firm Notes set forth on Schedule A opposite the name of such Initial Purchaser bears to the total aggregate principal amount of Firm Notes.

(d) Payment for the Notes. Payment for the Notes shall be made at the Closing Date (and, if applicable, at any Subsequent Closing Date) by wire transfer of immediately available funds to the order of the Company.

It is understood that the Representative has been authorized, for its own account and the accounts of the several Initial Purchasers, to accept delivery of and receipt for, and make payment of the purchase price for, the Firm Notes and any Optional Notes the Initial Purchasers have agreed to purchase. BAS, individually and not as the Representative of the Initial Purchasers, may (but shall not be obligated to) make payment for any Notes to be purchased by any Initial Purchaser whose funds shall not have been received by the Representative by the Closing Date or any Subsequent Closing Date, as the case may be, for the account of such Initial Purchaser, but any such payment shall not relieve such Initial Purchaser from any of its obligations under this Agreement.

(e) Delivery of the Notes. The Company shall deliver, or cause to be delivered, to the Representative for the accounts of the several Initial Purchasers the Firm Notes at the Closing Date, against the irrevocable release of a wire transfer of immediately available funds for the amount of the purchase price therefor. The Company shall also deliver, or cause to be delivered, to the Representative for the accounts of the several Initial Purchasers, the Optional Notes the Initial Purchasers have agreed to purchase at the Closing Date or any Subsequent Closing Date, as the case may be, against the irrevocable release of a wire transfer of immediately available funds for the amount of the purchase price therefor. Delivery of the Firm Notes and the Optional Notes shall be made through the facilities of The Depository Trust Company unless BAS shall otherwise instruct. Time shall be of the essence, and delivery at the time and place specified in this Agreement is a further condition to the obligations of the Initial Purchasers.

Section 3. Covenants of the Company

The Company covenants and agrees with each Initial Purchaser as follows:

(a) BAS Review of Proposed Amendments and Supplements. During such period beginning on the date hereof and ending on the date of the completion of the resale of the Notes by the Initial Purchasers (as notified by the Initial Purchasers to the Company), prior to amending or supplementing the Disclosure Package or the Final Offering Memorandum, the Company shall furnish to BAS for review a copy of each such proposed amendment or supplement, and the Company shall not print, use or distribute such proposed amendment or supplement to which BAS reasonably objects.

(b) Amendments and Supplements to the Offering Memorandum and Other Securities Act Matters. If, at any time prior to the completion of the resale of the Notes by the Initial Purchasers (as notified by the Initial Purchasers to the Company), any event or development shall occur or condition exist as a result of which it is necessary to amend or supplement the Disclosure Package or the Final Offering Memorandum in order that the Disclosure Package or the Final Offering Memorandum will not include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made or then prevailing, as the case may be, not misleading, or if in the opinion of BAS or counsel for the Initial Purchasers it is otherwise necessary to amend or supplement the Disclosure Package or the Final Offering Memorandum to comply with law, the Company shall promptly notify the Initial Purchasers and prepare, subject to Section 3(a) hereof, such amendment or supplement as may be necessary to correct such untrue statement or omission.

(c) Copies of Disclosure Package and the Offering Memorandum. The Company agrees to furnish to the Representative, without charge, until the earlier of nine months after the date hereof or the completion of the resale of the Notes by the Initial Purchasers (as notified by the Initial Purchasers to the Company) as many copies of the materials contained in the Disclosure Package and the Final Offering Memorandum and any amendments and supplements thereto as the Representative may request.

(d) Blue Sky Compliance. The Company shall cooperate with the Representative and counsel for the Initial Purchasers, as the Initial Purchasers may reasonably request from time to time, to qualify or register the Notes for sale under (or obtain exemptions from the application of) the state securities or blue sky laws or Canadian provincial securities laws or other foreign laws of those jurisdictions designated by the Representative, shall comply with such laws and shall continue such qualifications, registrations and exemptions in effect so long as required for the distribution of the Notes. The Company shall not be required to qualify as a foreign corporation or to take any action that would subject it to general service of process in any such jurisdiction where it is not presently qualified or where it would be subject to taxation as a foreign corporation, other than those arising out of the offering or sale of the Notes in any jurisdiction where it is not now so subject. The Company will advise the Representative promptly of the suspension of the qualification or registration of (or any such exemption relating to) the Notes for offering, sale or trading in any jurisdiction or any initiation or threat of any proceeding for any such purpose, and in the event of the issuance of any order suspending such qualification, registration or exemption, the Company shall use its best efforts to obtain the withdrawal thereof at the earliest possible moment.

(e) Rule 144A Information. For so long as any of the Notes are “restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act, the Company shall provide to any

holder of the Notes or to any prospective purchaser of the Notes designated by any holder, upon request of such holder or prospective purchaser, information required to be provided by Rule 144A(d)(4) of the Securities Act if, at the time of such request, the Company is not subject to the reporting requirements under Section 13 or 15(d) of the Exchange Act.

(f) Compliance with Securities Law. The Company will comply in all material respects with all applicable securities laws and rules and regulations promulgated thereunder, including, without limitation, the Xxxxxxxx-Xxxxx Act, and use its best efforts to cause the Company’s directors and officers, in their capacities as such, to comply with such laws, rules and regulations, including, without limitation, the provisions of the Xxxxxxxx-Xxxxx Act.

(g) Legends. Each of the Notes will bear, to the extent applicable, the legend contained in “Notice to Investors” in the Disclosure Package and the Final Offering Memorandum for the time period and upon the other terms stated therein.

(h) Written Information Concerning the Offering. Without the prior written consent of BAS, the Company will not give to any prospective purchaser of the Notes or any other person not in its employ any written information concerning the offering of the Notes other than the Disclosure Package, the Final Offering Memorandum or any other offering materials prepared by or with the prior consent of the Representative.

(i) No General Solicitation. The Company will not, and will cause its subsidiaries not to, solicit any offer to buy or offer to sell the Notes by means of any form of general solicitation or general advertising (as those terms are used in Regulation D under the Securities Act) or in any manner involving a public offering within the meaning of Section 4(2) of the Securities Act.

(j) No Integration. The Company will not, and will cause its subsidiaries not to, sell, offer for sale or solicit offers to buy or otherwise negotiate in respect of any “security” (as defined in the Securities Act) in a transaction that could be integrated with the sale of the Notes in a manner that would require the registration under the Securities Act of the Notes.

(k) Information to Publishers. Any information provided by the Company to publishers of publicly available databases about the terms of the Notes and the Indenture shall include a statement that the Notes have not been registered under the Securities Act and are subject to restrictions under Rule 144A of the Securities Act.

(l) DTC. The Company will cooperate with the Representative and use its best efforts to permit the Notes to be eligible for clearance and settlement through The Depository Trust Company.

(m) Rule 144 Tolling. For so long as any Notes or Conversion Shares constitute “restricted securities” under Rule 144 under Securities Act, the Company will not, and will not permit any of its “affiliates” (as defined in Rule 144 under the Securities Act) to, resell any of the Notes or Conversion Shares that have been reacquired by any of them.

(n) Use of Proceeds. The Company shall apply the net proceeds from the sale of the Notes sold by it in the manner described under the caption “Use of Proceeds” in the Disclosure Package and the Final Offering Memorandum.

(o) Transfer Agent. The Company shall engage and maintain, at its expense, a registrar and transfer agent for the Common Stock.

(p) Available Conversion Shares. The Company will reserve and keep available at all times, free of pre-emptive rights, the full number of Conversion Shares.

(q) Conversion Price. Between the date hereof and the Closing Date, the Company will not do or authorize any act or thing that would result in an adjustment of the conversion price.

(r) Company to Provide Interim Financial Statements and Other Information. Prior to the Closing Date, the Company will furnish the Initial Purchasers, as soon as they have been prepared by or are available to the Company, a copy of any unaudited interim financial statements of the Company for any period subsequent to the period covered by the most recent financial statements appearing in the Disclosure Package and the Final Offering Memorandum.

(s) Agreement Not to Offer or Sell Additional Securities. During the period commencing on the date hereof and ending on the 75th day following the date of the Final Offering Memorandum, the Company will not, without the prior written consent of BAS (which consent may be withheld at the sole discretion of BAS), directly or indirectly, sell, offer, contract or grant any option to sell, pledge, transfer or establish an open “put equivalent position” or liquidate or decrease a “call equivalent position” within the meaning of Rule 16a-1(h) under the Exchange Act, or otherwise dispose of or transfer (or enter into any transaction that is designed to, or might reasonably be expected to, result in the disposition of), or announce the offering of, or file any registration statement under the Securities Act in respect of, any shares of Common Stock, options or warrants to acquire shares of Common Stock or securities exchangeable or exercisable for or convertible into shares of Common Stock (other than as contemplated by this Agreement with respect to the Notes); provided, however, that (i) the Company may offer, issue and sell Common Stock or securities convertible into or exchangeable for Common Stock pursuant to any employee stock option plan, stock ownership plan or dividend reinvestment plan of the Company described in the Disclosure Package and the Final Memorandum and in effect on the date hereof and (ii) the Company may issue the Conversion Shares in accordance with the terms of the Notes.

(t) Future Reports to Stockholders. The Company will make available to its stockholders as soon as practicable after the end of each fiscal year an annual report (including a balance sheet and statements of income, stockholders’ equity and cash flows of the Company and its consolidated subsidiaries certified by independent public accountants) and, as soon as practicable after the end of each of the first three quarters of each fiscal year (beginning with the fiscal quarter ending after the date of the Final Offering Memorandum), to make available to its stockholders consolidated summary financial information of the Company and its subsidiaries for such quarter in reasonable detail.

(u) Future Reports to the Representative. During the period of five years hereafter, the Company will provide to the Representative at Xxx Xxxxxx Xxxx, Xxx Xxxx, XX 00000: (i) as soon as practicable after the end of each fiscal year, copies of the Annual Report of the Company containing the balance sheet of the Company as of the close of such fiscal year and statements of income, stockholders’ equity and cash flows for the year then ended and the opinion thereon of the Company’s independent public or certified public accountants; (ii) as soon as practicable after the filing thereof, copies of each proxy statement, Annual Report on Form 10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K or other report filed by the Company with the Commission, the Financial Industry Regulatory Authority (“FINRA”) or any securities exchange; and (iii) as soon as available, copies of any report or communication of the Company mailed

generally to holders of its capital stock; provided that the Company’s obligations pursuant to this Section 3(u) shall be deemed satisfied with respect to any document that is publicly available, free of charge, on the Commission’s XXXXX website.

(v) Investment Limitation. The Company shall not invest or otherwise use the proceeds received by the Company from its sale of the Notes in such a manner as would require the Company or any of its subsidiaries to register as an investment company under the Investment Company Act.

(w) No Manipulation of Price. The Company will not take, directly or indirectly, any action designed to cause or result in, or that has constituted or might reasonably be expected to constitute, under the Exchange Act or otherwise, the stabilization or manipulation of the price of any securities of the Company to facilitate the sale or resale of the Notes.

(x) New Lock-Up Agreements. The Company will enforce all agreements between the Company and any of its security holders to be entered into pursuant to this agreement that prohibit the sale, transfer, assignment, pledge or hypothecation of any of the Company’s securities. In addition, the Company will direct the transfer agent to place stop transfer restrictions upon any such securities of the Company that are bound by such “lock-up” agreements for the duration of the periods contemplated in such agreements.

(y) Final Term Sheet. The Company will prepare a final term sheet, containing solely a description of the Notes and the offering thereof, in the form approved by you and attached as Schedule B hereto (the “Final Term Sheet”).

Section 4. Payment of Expenses

The Company agrees to pay all costs, fees and expenses incurred in connection with the performance of its obligations hereunder and in connection with the transactions contemplated hereby, including without limitation (i) all expenses incident to the issuance and delivery of the Notes (including all printing and engraving costs), (ii) all fees and expenses of the Trustee under the Indenture, (iii) all necessary issue, transfer and other stamp taxes in connection with the issuance and sale of the Notes to the Initial Purchasers, (iv) all fees and expenses of the Company’s counsel, independent public or certified public accountants and other advisors, (v) all costs and expenses incurred in connection with the preparation, printing, shipping and distribution of the materials contained in the Disclosure Package, including the Preliminary Offering Memorandum, and the Final Offering Memorandum, all amendments and supplements thereto and this Agreement, (vi) all filing fees, attorneys’ fees and expenses incurred by the Company or the Initial Purchasers in connection with qualifying or registering (or obtaining exemptions from the qualification or registration of) all or any part of the Notes for offer and sale under the state securities or blue sky laws or the provincial securities laws of Canada, and, if requested by the Representative, preparing and printing a “Blue Sky Survey” or memorandum, and any supplements thereto, advising the Initial Purchasers of such qualifications, registrations and exemptions, (vii) the expenses of the Company and the Initial Purchasers in connection with the marketing and offering of the Notes, including all transportation and other expenses incurred in connection with presentations to prospective purchasers of the Notes, (viii) the fees and expenses associated with listing the Conversion Shares on the Nasdaq Global Market and (ix) all expenses and fees in connection with admitting the Notes for trading in the PORTAL Market. Except as provided in this Section 4, Section 7, Section 10 and Section 11 hereof, the Initial Purchasers shall pay their own expenses, including the fees and disbursements of their counsel.

Section 5. Conditions of the Obligations of the Initial Purchasers

The obligations of the several Initial Purchasers to purchase and pay for the Notes as provided herein on the Closing Date and, with respect to the Optional Notes, any Subsequent Closing Date, shall be subject to the accuracy of the representations and warranties on the part of the Company set forth in Section 1 hereof as of the date hereof and as of the Closing Date as though then made and, with respect to the Optional Notes, as of any Subsequent Closing Date as though then made, to the accuracy of the statements of the Company made in any certificates pursuant to the provisions hereof, to the timely performance by the Company of its covenants and other obligations hereunder, and to each of the following additional conditions:

(a) Accountants’ Comfort Letter. On the date hereof, the Representative shall have received from (i) PricewaterhouseCoopers LLP, independent public accountants for the Company for the year ended December 31, 2007, a letter dated the date hereof addressed to the Initial Purchasers, the form of which is attached as Exhibit A-I, and (ii) Ernst & Young LLP, independent public accountants for the Company for the years ended December 31, 2006 and 2005, a letter dated the date hereof addressed to the Initial Purchasers, the form of which is attached as Exhibit A-II.

(b) No Material Adverse Change and or Ratings Agency Change. For the period from and after the date of this Agreement and prior to the Closing Date and, with respect to the Optional Notes, any Subsequent Closing Date:

(i) in the judgment of BAS there shall not have occurred any Material Adverse Change; and

(ii) there shall not have been any change or decrease specified in the letter or letters referred to in paragraph (a) of this Section 5 which is, in the sole judgment of BAS, so material and adverse as to make it impractical or inadvisable to proceed with the offering or delivery of the Notes as contemplated by the Disclosure Package and the Final Offering Memorandum; and

(iii) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded any securities of the Company or any of its subsidiaries by any “nationally recognized statistical rating organization” as such term is defined for purposes of Rule 436(g)(2) under the Securities Act.

(c) Opinion of Counsel for the Company. On each of the Closing Date and any Subsequent Closing Date, the Representative shall have received the favorable opinions of Xxxxxx Xxxxxxx Xxxxx & Xxxxxx LLP, counsel for the Company, and Xxxxxxx Xxxxxx Xxxxxx & Dodge, special patent counsel for the Company, each dated as of such Closing Date or Subsequent Closing Date, in form and substance reasonably satisfactory to, and addressed to, the Representative, with respect to the issuance and sale of the Notes, the Disclosure Package, the Preliminary Offering Memorandum, the Final Offering Memorandum and other related matters as the Representative may reasonably require, and the Company shall have furnished to such counsels such documents as they request for the purpose of enabling them to pass upon such matters.

(d) Opinion of Counsel for the Initial Purchasers. On the Closing Date and any Subsequent Closing Date, the Representative shall have received the favorable opinion of Xxxxxx Xxxxxxxx Xxxxx & Xxxxxxxx LLP, counsel for the Initial Purchasers, dated as of such Closing Date or Subsequent Closing Date, in form and substance satisfactory to, and addressed to, the Representative, with respect to the issuance and sale of the Notes, the Disclosure Package, the Preliminary Offering Memorandum, the Final Offering Memorandum and other related matters as the Representative may reasonably require, and the Company shall have furnished to such counsel such documents as they request for the purpose of enabling them to pass upon such matters.

(e) Officers’ Certificate. On the Closing Date and any Subsequent Closing Date, the Representative shall have received a written certificate executed by the Chairman of the Board, Chief Executive Officer or President of the Company and the Chief Financial Officer or Chief Accounting Officer of the Company, dated as of such Closing Date or Subsequent Closing Date, to the effect that the signers of such certificate have carefully examined the Disclosure Package, including the Preliminary Offering Memorandum, and the Final Offering Memorandum, any amendments or supplements thereto and this Agreement, to the effect set forth in subsection (b)(iii) of this Section 5, and further to the effect that:

(i) for the period from and after the date of this Agreement and prior to such Closing Date or Subsequent Closing Date, there has not occurred any Material Adverse Change;

(ii) the representations and warranties of the Company set forth in Section 1 of this Agreement are true and correct on and as of such Closing Date or Subsequent Closing Date with the same force and effect as though expressly made on and as of such Closing Date or such Subsequent Closing Date; and

(iii) the Company has complied with all the agreements hereunder and satisfied all the conditions on its part to be performed or satisfied hereunder at or prior to such Closing Date or Subsequent Closing Date.

(f) Bring-down Comfort Letter. On the Closing Date and any Subsequent Closing Date, the Representative shall have received from PricewaterhouseCoopers LLP, independent public accountants for the Company, a letter dated such date, in form and substance satisfactory to the Representative, to the effect that they reaffirm the statements made in the letter furnished by them pursuant to subsection (a) of this Section 5, except that the specified date referred to therein for the carrying out of procedures shall be no more than three business days prior to such Closing Date or Subsequent Closing Date.

(g) Lock-Up Agreement from Certain Securityholders of the Company. On or prior to the date hereof, the Company shall have furnished to the Representative an agreement in the form of Exhibit B hereto from the persons set forth on Schedule E hereto, and such agreement shall be in full force and effect on each of the Closing Date and any Subsequent Closing Date.

(h) PORTAL Designation. The Notes shall have been designated PORTAL-eligible securities in accordance with the rules and regulations of NASDAQ.

(i) Nasdaq. The Company shall have applied to have the Conversion Shares approved for listing, subject to notice of issuance, on the Nasdaq Global Market, and satisfactory evidence of such actions have been provided to the Representative.

(j) Credit Agreement Amendment. The second amendment to the Credit Agreement, in the form attached as Exhibit C hereto, shall have become effective.

(k) Additional Documents. On or before each of the Closing Date and any Subsequent Closing Date, the Representative and counsel for the Initial Purchasers shall have received such information, documents and opinions as they may reasonably require for the purposes of enabling them to pass upon the issuance and sale of the Notes as contemplated herein, or in order to evidence the accuracy of any of the representations and warranties, or the satisfaction of any of the conditions or agreements, herein contained.

If any condition specified in this Section 5 is not satisfied when and as required to be satisfied, this Agreement may be terminated by BAS by notice to the Company at any time on or prior to the Closing Date and, with respect to the Optional Notes, at any time prior to the applicable Subsequent Closing Date, which termination shall be without liability on the part of any party to any other party, except that Section 4, Section 7, Section 8, Section 9 and Section 14 shall at all times be effective and shall survive such termination.

Section 6. Representations, Warranties and Agreements of Initial Purchasers

Each of the Initial Purchasers represents and warrants that it is a “qualified institutional buyer,” as defined in Rule 144A under the Securities Act. Each Initial Purchaser agrees with the Company that:

(a) it has not offered or sold, and will not offer or sell, any Notes within the United States or to, or for the account or benefit of, U.S. persons (x) as part of their distribution at any time or (y) otherwise until one year after the later of the commencement of the offering and the date of closing of the offering, except to those it reasonably believes to be “qualified institutional buyers” (as defined in Rule 144A under the Securities Act);

(b) neither it nor any person acting on its behalf has made or will make offers or sales of the Notes by means of any form of general solicitation or general advertising (within the meaning of Regulation D) in the United States;

(c) in connection with each sale pursuant to Section 6(a), it has taken or will take reasonable steps to ensure that the purchaser of such Notes is aware that such sale is being made in reliance on Rule 144A under the Securities Act;

(d) any information provided by the Initial Purchasers to publishers of publicly available databases about the terms of the Notes and the Indenture shall include a statement that the Notes have not been registered under the Securities Act and are subject to restrictions under Rule 144A under the Securities Act; and

(e) it acknowledges that additional restrictions on the offer and sale of the Notes and the Common Stock issuable upon conversion thereof are described in the Disclosure Package and the Final Offering Memorandum.

Section 7. Reimbursement of Initial Purchasers’ Expenses

If this Agreement is terminated pursuant to Section 5, Section 10 or Section 11, or if the sale to the Initial Purchasers of the Notes on the Closing Date or any Subsequent Closing Date is not consummated because of any refusal, inability or failure on the part of the Company to

perform any agreement herein or to comply with any provision hereof, the Company agrees to reimburse the Representative and the other Initial Purchasers (or such Initial Purchasers as have terminated this Agreement with respect to themselves), severally, upon demand for all out-of-pocket expenses that shall have been reasonably incurred by the Representative and the Initial Purchasers in connection with the proposed purchase and the offering and sale of the Notes, including but not limited to fees and disbursements of counsel, printing expenses, travel expenses, postage, facsimile and telephone charges.

Section 8. Indemnification

(a) Indemnification of the Initial Purchasers. The Company agrees to indemnify and hold harmless each Initial Purchaser, its directors, officers, employees and agents, and each person, if any, who controls any Initial Purchaser within the meaning of the Securities Act or the Exchange Act against any loss, claim, damage, liability or expense, as incurred, to which such Initial Purchaser, director, officer, employee, agent or controlling person may become subject, insofar as such loss, claim, damage, liability or expense (or actions in respect thereof as contemplated below) arises out of or is based upon any untrue statement or alleged untrue statement of a material fact contained in the Preliminary Offering Memorandum, the Final Offering Memorandum, the information contained in the Final Term Sheet, any Issuer Written Information or any other written information used by or on behalf of the Company in connection with the offer or sale of the Notes (or any amendment or supplement to the foregoing), or the omission or alleged omission therefrom of a material fact, in each case, necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, and to reimburse each Initial Purchaser, its officers, directors, employees, agents and each such controlling person for any and all expenses (including the fees and disbursements of counsel chosen by BAS) as such expenses are reasonably incurred by such Initial Purchaser, or its officers, directors, employees, agents or such controlling person in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage, liability, expense or action; provided, however, that the foregoing indemnity agreement shall not apply to any loss, claim, damage, liability or expense to the extent, but only to the extent, arising out of or based upon any untrue statement or alleged untrue statement or omission or alleged omission based upon and in conformity with written information furnished to the Company by any Initial Purchaser through BAS expressly for use in the Preliminary Offering Memorandum, the Final Offering Memorandum, the Final Term Sheet, any Issuer Written Information or any other written information used by or on behalf of the Company in connection with the offer or sale of the Notes (or any amendment or supplement thereto), it being understood and agreed that the only such information furnished by any Initial Purchaser consists of the information described as such in Section 8(b) hereof. The indemnity agreement set forth in this Section 8(a) shall be in addition to any liabilities that the Company may otherwise have.

(b) Indemnification of the Company, its Directors and Officers. Each Initial Purchaser agrees, severally and not jointly, to indemnify and hold harmless the Company, each of its directors, each of its officers and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act, against any loss, claim, damage, liability or expense, as incurred, to which the Company, or any such director, officer or controlling person may become subject, insofar as such loss, claim, damage, liability or expense (or actions in respect thereof as contemplated below) arises out of or is based upon any untrue or alleged untrue statement of a material fact contained in the Preliminary Offering Memorandum, the Final Offering Memorandum, the information contained in the Final Term Sheet, any Issuer Written Information or any other written information used by or on behalf of the Company in connection

with the offer or sale of the Notes (or any amendment or supplement thereto), or arises out of or is based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, and only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Preliminary Offering Memorandum, the Final Offering Memorandum, the Final Term Sheet, any Issuer Written Information or any other written information used by or on behalf of the Company in connection with the offer or sale of the Notes (or any amendment or supplement thereto), in reliance upon and in conformity with written information furnished to the Company by BAS expressly for use therein; and to reimburse the Company, or any such director, officer or controlling person for any legal and other expense reasonably incurred by the Company, or any such director, officer or controlling person in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage, liability, expense or action. The Company hereby acknowledges that the only information that the Initial Purchasers have furnished to the Company expressly for use in the Preliminary Offering Memorandum, the Final Offering Memorandum, the Final Term Sheet, any Issuer Written Information or any other written information used by or on behalf of the Company in connection with the offer or sale of the Notes (or any amendment or supplement thereto) are the statements set forth in Schedule C. The indemnity agreement set forth in this Section 8(b) shall be in addition to any liabilities that each Initial Purchaser may otherwise have.

(c) Notifications and Other Indemnification Procedures. Promptly after receipt by an indemnified party under this Section 8 of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against an indemnifying party under this Section 8, notify the indemnifying party in writing of the commencement thereof, but the failure to so notify the indemnifying party (i) will not relieve it from liability under paragraph (a) or (b) above unless and to the extent it did not otherwise learn of such action and such failure results in the forfeiture by the indemnifying party of substantial rights and defenses and (ii) will not, in any event, relieve the indemnifying party from any obligations to any indemnified party other than the indemnification obligation provided in paragraph (a) or (b) above. In case any such action is brought against any indemnified party and such indemnified party seeks or intends to seek indemnity from an indemnifying party, the indemnifying party will be entitled to participate in, and, to the extent that it shall elect, jointly with all other indemnifying parties similarly notified, by written notice delivered to the indemnified party promptly after receiving the aforesaid notice from such indemnified party, to assume the defense thereof with counsel satisfactory to such indemnified party; provided, however, if the defendants in any such action include both the indemnified party and the indemnifying party and the indemnified party shall have reasonably concluded that a conflict may arise between the positions of the indemnifying party and the indemnified party in conducting the defense of any such action or that there may be legal defenses available to it and/or other indemnified parties that are different from or additional to those available to the indemnifying party, the indemnified party or parties shall have the right to select separate counsel to assume such legal defenses and to otherwise participate in the defense of such action on behalf of such indemnified party or parties. Upon receipt of notice from the indemnifying party to such indemnified party of such indemnifying party’s election so to assume the defense of such action and approval by the indemnified party of counsel, the indemnifying party will not be liable to such indemnified party under this Section 8 for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof unless (i) the indemnified party shall have employed separate counsel in accordance with the proviso to the preceding sentence (it being understood, however, that the indemnifying party shall not be liable for the expenses of more than one separate counsel (other than local counsel), reasonably approved by the indemnifying party (or by BAS in the case of Section 8(b)),

representing the indemnified parties who are parties to such action) or (ii) the indemnifying party shall not have employed counsel satisfactory to the indemnified party to represent the indemnified party within a reasonable time after notice of commencement of the action, in each of which cases the fees and expenses of counsel shall be at the expense of the indemnifying party.

(d) Settlements. The indemnifying party under this Section 8 shall not be liable for any settlement of any proceeding effected without its written consent, which shall not be withheld unreasonably, but if settled with such consent or if there is a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party against any loss, claim, damage, liability or expense by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by Section 8(c) hereof, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement, compromise or consent to the entry of judgment in any pending or threatened action, suit or proceeding in respect of which any indemnified party is or could have been a party and indemnity was or could have been sought hereunder by such indemnified party, unless such settlement, compromise or consent (x) includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such action, suit or proceeding and (y) does not include a statement as to or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party.

Section 9. Contribution

If the indemnification provided for in Section 8 is for any reason unavailable to or otherwise insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities or expenses referred to therein, then each indemnifying party shall contribute to the aggregate amount paid or payable by such indemnified party, as incurred, as a result of any losses, claims, damages, liabilities or expenses referred to therein (i) in such proportion as is appropriate to reflect the relative benefits received by the Company, on the one hand, and the Initial Purchasers, on the other hand, from the offering of the Notes pursuant to this Agreement or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company, on the one hand, and the Initial Purchasers, on the other hand, in connection with the untrue statements or omissions or alleged untrue statements or alleged omissions which resulted in such losses, claims, damages, liabilities or expenses, as well as any other relevant equitable considerations. The relative benefits received by the Company, on the one hand, and the Initial Purchasers, on the other hand, in connection with the offering of the Notes pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of the Notes pursuant to this Agreement (before deducting expenses) received by the Company, and the total purchase discount received by the Initial Purchasers bear to the aggregate initial offering price of the Notes. The relative fault of the Company, on the one hand, and the Initial Purchasers, on the other hand, shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company, on the one hand, or the Initial Purchasers, on the other hand, and the

parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

The amount paid or payable by a party as a result of the losses, claims, damages, liabilities and expenses referred to above shall be deemed to include, subject to the limitations set forth in Section 8(c), any legal or other fees or expenses reasonably incurred by such party in connection with investigating or defending any action or claim.

The Company and the Initial Purchasers agree that it would not be just and equitable if contribution pursuant to this Section 9 were determined by pro rata allocation (even if the Initial Purchasers were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in this Section 9.

Notwithstanding the provisions of this Section 9, no Initial Purchaser shall be required to contribute any amount in excess of the purchase discount or commission received by such Initial Purchaser in connection with the Notes purchased by it hereunder. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Initial Purchasers’ obligations to contribute pursuant to this Section 9 are several, and not joint, in proportion to their respective purchasing commitments as set forth opposite their names in Schedule A. For purposes of this Section 9, each director, officer, employee and agent of an Initial Purchaser and each person, if any, who controls an Initial Purchaser within the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as such Initial Purchaser, and each director of the Company, each officer of the Company, and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act shall have the same rights to contribution as the Company.

Section 10. Default of One or More of the Several Initial Purchasers

If, on the Closing Date or a Subsequent Closing Date, as the case may be, any one or more of the several Initial Purchasers shall fail or refuse to purchase Notes that it or they have agreed to purchase hereunder on such date, and the aggregate principal amount of Notes which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or refused to purchase does not exceed 10% of the aggregate principal amount of the Notes to be purchased on such date, the other Initial Purchasers shall be obligated, severally, in the proportions that the aggregate principal amount of Firm Notes set forth opposite their respective names on Schedule A bears to the aggregate principal amount of Firm Notes set forth opposite the names of all such non-defaulting Initial Purchasers, or in such other proportions as may be specified by BAS with the consent of the non-defaulting Initial Purchasers, to purchase the Notes which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or refused to purchase on such date. If, on the Closing Date or a Subsequent Closing Date, as the case may be, any one or more of the Initial Purchasers shall fail or refuse to purchase Notes and the aggregate principal amount of Notes with respect to which such default occurs exceeds 10% of the aggregate principal amount of Notes to be purchased on such date, and arrangements satisfactory to BAS and the Company for the purchase of such Notes are not made within 48 hours after such default, this Agreement shall terminate without liability of any party to any other party except that the provisions of Section 4, Section 7, Section 8 and Section 9 shall at all times be effective and shall survive such termination. In any such case either BAS or the Company shall have the right to postpone the Closing Date or a Subsequent Closing Date, as the case may be, but in no event for longer than seven days in order that the required changes, if any, to the Final Offering Memorandum or any other documents or arrangements may be effected.

As used in this Agreement, the term “Initial Purchaser” shall be deemed to include any person substituted for a defaulting Initial Purchaser under this Section 10. Any action taken under this Section 10 shall not relieve any defaulting Initial Purchaser from liability in respect of any default of such Initial Purchaser under this Agreement.

Section 11. Termination of this Agreement

Prior to the Closing Date and, with respect to the Optional Notes, any Subsequent Closing Date, this Agreement may be terminated by BAS by notice given to the Company if at any time (i) trading or quotation in any of the Company’s securities shall have been suspended or limited by the Commission or by the Nasdaq Global Market, or trading in securities generally on the New York Stock Exchange or the Nasdaq Global Market shall have been suspended or limited, or minimum or maximum prices shall have been generally established by the Commission or FINRA or on either such stock exchange; (ii) a general banking moratorium shall have been declared by federal or New York authorities or a material disruption in commercial banking or securities settlement or clearance services in the United States has occurred; or (iii) there shall have occurred any outbreak or escalation of national or international hostilities or declaration of a national emergency or war by the United States or any crisis or calamity, or any change in the United States or international financial markets, or any substantial change or development involving a prospective substantial change in United States’ or international political, financial or economic conditions, as in the judgment of BAS is material and adverse and makes it impracticable or inadvisable to market the Notes in the manner and on the terms described in the Disclosure Package and the Final Offering Memorandum or to enforce contracts for the sale of securities. Any termination pursuant to this Section 11 shall be without liability on the part of (a) the Company to any Initial Purchaser, except that the Company shall be obligated to reimburse the expenses of the Representative and the Initial Purchasers pursuant to Sections 4 and 7 hereof or (b) any Initial Purchaser to the Company.

Section 12. No Advisory or Fiduciary Responsibility

The Company acknowledges and agrees that: (i) the purchase and sale of the Notes pursuant to this Agreement, including the determination of the offering price of the Notes and any related discounts and commissions, is an arm’s-length commercial transaction between the Company, on the one hand, and the several Initial Purchasers, on the other hand, and the Company is capable of evaluating and understanding and understands and accepts the terms, risks and conditions of the transactions contemplated by this Agreement; (ii) in connection with each transaction contemplated hereby and the process leading to such transaction each Initial Purchaser is and has been acting solely as a principal and is not the financial advisor, agent or fiduciary of the Company or its affiliates, stockholders, creditors or employees or any other party; (iii) no Initial Purchaser has assumed or will assume an advisory, agency or fiduciary responsibility in favor of the Company with respect to any of the transactions contemplated hereby or the process leading thereto (irrespective of whether such Initial Purchaser has advised or is currently advising the Company on other matters) and no Initial Purchaser has any obligation to the Company with respect to the offering contemplated hereby except the obligations expressly set forth in this Agreement; (iv) the several Initial Purchasers and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company and that the several Initial Purchasers have no obligation to disclose any of such interests by virtue of any advisory, agency or fiduciary relationship; and (v) the Initial Purchasers have not provided any legal, accounting, regulatory or tax advice with respect to the offering contemplated hereby and the Company has consulted its own legal, accounting, regulatory and tax advisors to the extent it deemed appropriate.

The Company hereby waives and releases, to the fullest extent permitted by law, any claims that the Company may have against the several Initial Purchasers with respect to any breach or alleged breach of agency or fiduciary duty.

Section 13. Research Analyst Independence

The Company acknowledges that the Initial Purchasers’ research analysts and research departments are required to be independent from their respective investment banking divisions and are subject to certain regulations and internal policies, and that such Initial Purchasers’ research analysts may hold views and make statements or investment recommendations and/or publish research reports with respect to the Company and/or the offering that differ from the views of their respective investment banking divisions. The Company hereby waives and releases, to the fullest extent permitted by law, any claims that the Company may have against the Initial Purchasers with respect to any conflict of interest that may arise from the fact that the views expressed by their independent research analysts and research departments may be different from or inconsistent with the views or advice communicated to the Company by such Initial Purchasers’ investment banking divisions. The Company acknowledges that each of the Initial Purchasers is a full service securities firm and as such from time to time, subject to applicable securities laws, may effect transactions for its own account or the account of its customers and hold long or short positions in debt or equity securities of the companies that may be the subject of the transactions contemplated by this Agreement.

Section 14. Representations and Indemnities to Survive Delivery

The respective indemnities, agreements, representations, warranties and other statements of the Company, of its officers and of the several Initial Purchasers set forth in or made pursuant to this Agreement (i) will remain operative and in full force and effect, regardless of any (A) investigation, or statement as to the results thereof, made by or on behalf of any Initial Purchaser, the officers or employees of any Initial Purchaser, or any person controlling the Initial Purchaser, the Company, the officers or employees of the Company or any person controlling the Company, as the case may be or (B) acceptance of the Notes and payment for them hereunder and (ii) will survive delivery of and payment for the Notes sold hereunder and any termination of this Agreement.

Section 15. Notices

All communications hereunder shall be in writing and shall be mailed, hand delivered or telecopied and confirmed to the parties hereto as follows:

If to BAS:

Banc of America Securities LLC

Xxx Xxxxxx Xxxx

Xxx Xxxx, XX 00000

Facsimile: (000) 000-0000

Attention: Syndicate Department

with a copy to:

Banc of America Securities LLC

Xxx Xxxxxx Xxxx

Xxx Xxxx, XX 00000

Facsimile: (000) 000-0000

Attention: ECM – Legal

If to the Company:

Salix Pharmaceuticals, Ltd.

0000 Xxxxxxxxx Xxxx Xxxxx

Xxxxxxxxxxx, Xxxxx Xxxxxxxx 00000

Facsimile: (000) 000 0000

Attention: General Counsel

Any party hereto may change the address for receipt of communications by giving written notice to the others.

Section 16. Successors and Assigns

This Agreement will inure to the benefit of and be binding upon the parties hereto, including any substitute Initial Purchasers pursuant to Section 10 hereof, and to the benefit of (i) the Company, its directors and any person who controls the Company within the meaning of the Securities Act or the Exchange Act, (ii) the Initial Purchasers, the officers, directors, employees and agents of the Initial Purchasers and each person, if any, who controls any Initial Purchaser within the meaning of the Securities Act or the Exchange Act and (iii) the respective successors and assigns of any of the above, all as and to the extent provided in this Agreement, and no other person shall acquire or have any right under or by virtue of this Agreement. The term “successors and assigns” shall not include a purchaser of any of the Notes from any of the several Initial Purchasers merely because of such purchase.

Section 17. Partial Unenforceability

The invalidity or unenforceability of any Section, paragraph or provision of this Agreement shall not affect the validity or enforceability of any other Section, paragraph or provision hereof. If any Section, paragraph or provision of this Agreement is for any reason determined to be invalid or unenforceable, there shall be deemed to be made such changes (and only such changes) as are necessary to make it valid and enforceable.

Section 18. Governing Law Provisions

(a) Governing Law Provisions. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

(b) Consent to Jurisdiction. Any legal suit, action or proceeding arising out of or based upon this Agreement or the transactions contemplated hereby may be instituted in the federal courts of the United States of America located in the City and County of New York, Borough of Manhattan or the courts of the State of New York in each case located in the City and County of New York, Borough of Manhattan (collectively, the “Specified Courts”), and each party irrevocably submits to the exclusive jurisdiction (except for proceedings instituted in regard to the enforcement of a judgment of any such court, as to which such jurisdiction is non-exclusive) of such courts in any such suit, action or proceeding. Service of any process, summons, notice or document by mail to such party’s address set forth above shall be effective service of process for any suit, action or other proceeding brought in any such court. The parties irrevocably and

unconditionally waive any objection to the laying of venue of any suit, action or other proceeding in the Specified Courts and irrevocably and unconditionally waive and agree not to plead or claim in any such court that any such suit, action or other proceeding brought in any such court has been brought in an inconvenient forum.

Section 19. General Provisions

This Agreement constitutes the entire agreement of the parties to this Agreement and supersedes all prior written or oral and all contemporaneous oral agreements, understandings and negotiations with respect to the subject matter hereof. This Agreement may be executed in two or more counterparts, each one of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Agreement may not be amended or modified unless in writing by all of the parties hereto, and no condition herein (express or implied) may be waived unless waived in writing by each party whom the condition is meant to benefit. The Section headings herein are for the convenience of the parties only and shall not affect the construction or interpretation of this Agreement.

Each of the parties hereto acknowledges that it is a sophisticated business person who was adequately represented by counsel during negotiations regarding the provisions hereof, including, without limitation, the indemnification provisions of Section 8 and the contribution provisions of Section 9, and is fully informed regarding said provisions. Each of the parties hereto further acknowledges that the provisions of Sections 8 and 9 hereto fairly allocate the risks in light of the ability of the parties to investigate the Company, its affairs and its business in order to assure that adequate disclosure has been made in the Disclosure Package and Final Offering Memorandum (and any amendments and supplements thereto).

[The remainder of this page has been intentionally left blank.]

If the foregoing is in accordance with your understanding of our agreement, kindly sign and return to the Company the enclosed copies hereof, whereupon this instrument, along with all counterparts hereof, shall become a binding agreement in accordance with its terms.


Very truly yours,
SALIX PHARMACEUTICALS, LTD.

By:		/s/ Xxxxxxx X. Xxxxx
Name:		Xxxxxxx X. Xxxxx
Title:		President & CEO

The foregoing Purchase Agreement is hereby confirmed and accepted by the Representative as of the date first above written.


BANC OF AMERICA SECURITIES LLC

By:		/s/ Xxxxx XxXxxxxxx
Name:		Xxxxx XxXxxxxxx
Title:		Managing Director

Acting as Representative of the several Initial Purchasers named in the attached Schedule A.

[Signature Page to the Purchase Agreement]

SCHEDULE A


Initial Purchasers	Aggregate Principal Amount of Firm Notes to be Purchased
Banc of America Securities LLC	$	49,500,000
Xxxx Capital Partners, LLC	$	5,500,000

Total	$	55,000,000

A-1

SCHEDULE B

Pricing term sheet dated August 18, 2008 to Preliminary Offering Memorandum dated August 18, 2008 (the “Preliminary Offering Memorandum”)

Salix Pharmaceuticals, Ltd.

$55,000,000

5.5% Convertible Senior Notes due 2028


Issuer:		Salix Pharmaceuticals, Ltd., a Delaware corporation (“Salix”).

Ticker/Exchange:		SLXP / The NASDAQ Global Select Market.

Title of Securities:		5.5% Convertible Senior Notes due 2028 (the “notes”).

Aggregate Principal Amount Offered:		$55,000,000 aggregate principal amount of notes (excluding the initial purchasers’ option to purchase up to $5,000,000 of additional aggregate principal amount of notes).

Proceeds Net of Any Commissions Payable to the Initial Purchasers and Expenses in Connection with the Offering:		Approximately $52,400,000 (without giving effect to any exercise of the initial purchasers’ option to purchase up to $5,000,000 of additional aggregate principal amount of notes).

Ranking		Senior unsecured.

Maturity:		August 15, 2028.

Annual Interest Rate:		5.5% per annum.

Interest Payment Dates:		Interest will accrue from August 22, 2008, and will be payable semi-annually in arrears on February 15 and August 15 of each year, beginning on February 15, 2009.

Issue Price:		100%, plus accrued interest, if any, from August 22, 2008.

Closing Stock Price:		$7.71 as of August 18, 2008.

B-1


Conversion Premium:		20% above the Closing Stock Price.

Initial Conversion Price:		Approximately $9.25 per share of common stock.

Initial Conversion Rate:		108.0847 shares of common stock per $1,000 aggregate principal amount of notes.

Optional Redemption:		Salix may, at its option, redeem the notes, in whole or in part, for cash, upon no less than 30 days’ nor more than 60 days’ notice before the redemption date, at any time on or after August 15, 2013. The redemption price will be equal to the principal amount of the notes to be redeemed, plus any accrued and unpaid interest, including any additional interest, to, but excluding, the redemption date.

Conversion Trigger Price:		Approximately $12.03, which is 130% of the Initial Conversion Price.

Sole Book-Running Manager:		Banc of America Securities LLC.

Co-Manager:		Xxxx Capital Partners, LLC.

Trade Date:		August 19, 2008.

Settlement Date:		August 22, 2008.

CUSIP Number:		000000XX0

ISIN:		XX000000XX00

Xxxxxxxxxx of Notes by Salix at Option of Holders:		On August 15, 2013, August 15, 2018 and August 15, 2023, holders may require Salix to purchase all or a portion of their notes for cash at a price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest, including any additional interest, to, but excluding, the repurchase date.

B-2


Fundamental Change:		If Salix undergoes a fundamental change (as defined under “Description of Notes—Fundamental Change Permits Holders to Require us to Purchase Notes” in the Preliminary Offering Memorandum), holders will have the option to require Salix to purchase all or any portion of their notes. The fundamental change purchase price will be 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest, including any additional interest, to, but excluding, the fundamental change purchase date. Salix will pay cash for all notes so purchased.

Adjustment to Conversion Rate upon a Make-Whole Fundamental Change:		The following table sets forth numbers of additional shares of Salix’s common stock to be received per $1,000 principal amount of notes upon conversion in connection with a make-whole fundamental change (as defined under “Description of Notes—Conversion Rights—Adjustment to Shares Delivered Upon Conversion upon Certain Corporate Transactions” in the Preliminary Offering Memorandum) based upon hypothetical stock prices and effective dates as specified:


	Stock Price
Effective Date	$7.71	$8.25	$9.25	$10.50	$12.00	$13.50	$15.00	$17.50	$20.00	$22.50	$25.00
August 18, 2008	21.6169	18.4486	14.0882	10.2962	7.2569	5.1893	3.7286	2.1095	1.1103	0.4815	0.0793
August 15, 2009	21.6169	17.6122	13.0612	9.2867	6.3819	4.4782	3.1753	1.7438	0.8753	0.3325	0.0000
August 15, 2010	21.6169	16.5940	11.8828	8.1438	5.4236	3.7301	2.6086	1.4067	0.6853	0.2505	0.0000
August 15, 2011	21.6169	15.2486	10.0017	6.2486	3.8486	2.5375	1.7486	0.9610	0.4853	0.1838	0.0000
August 15, 2012	21.6169	13.6244	7.1585	3.1629	1.2986	0.6338	0.3553	0.0924	0.0000	0.0000	0.0000
August 15, 2013	21.6169	13.1274	0.0234	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000

The exact stock prices and effective dates may not be set forth in the table above, in which case:

•

if the stock price is between two stock prices in the table or the effective date is between two effective dates in the table, the number of additional shares will be determined by a straight-line interpolation between the number of additional shares set forth for the higher and lower stock prices and the earlier and later effective dates, based on a 365-day year, as applicable;

•

if the stock price is greater than $25.00 per share (subject to adjustment), no additional shares will be issued upon conversion; and

•

if the stock price is less than $7.71 per share (subject to adjustment), no additional shares will be issued upon conversion.

Notwithstanding the foregoing, in no event will the total number of shares of Salix’s common stock issuable upon conversion of notes exceed 129.7017 per $1,000 principal amount of such notes, subject to adjustments in the same manner as the applicable

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conversion rate as set forth under “Description of Notes—Conversion Rights—Conversion Rate Adjustments” in the Preliminary Offering Memorandum.

This communication is intended for the sole use of the person to whom it is provided by the sender.

This communication shall not constitute an offer to sell or the solicitation of an offer to buy securities nor shall there be any sale of these securities in any state in which such solicitation or sale would be unlawful prior to registration or qualification of these securities under the laws of any such state.

Neither the notes nor the shares of common stock, if any, issuable upon conversion of the notes have been registered under the Securities Act of 1933, as amended (the “Securities Act”), or any state securities laws, and neither may be offered or sold within the United States or to, or for the account or benefit of, U.S. persons except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act or any other applicable securities laws. Accordingly, the notes are being offered and sold only to “qualified institutional buyers” (as defined in Rule 144A under the Securities Act).

The information in this term sheet supplements the Preliminary Offering Memorandum and supersedes the information in the Preliminary Offering Memorandum to the extent inconsistent with the information in the Preliminary Offering Memorandum. This term sheet is qualified in its entirety by reference to the Preliminary Offering Memorandum. Terms used herein but not defined herein shall have the respective meanings as set forth in the Preliminary Offering Memorandum.

ANY DISCLAIMER OR OTHER NOTICES THAT MAY APPEAR BELOW ARE NOT APPLICABLE TO THIS COMMUNICATION AND SHOULD BE DISREGARDED. SUCH DISCLAIMERS OR OTHER NOTICES WERE AUTOMATICALLY GENERATED AS A RESULT OF THIS COMMUNICATION BEING SENT VIA BLOOMBERG OR ANOTHER EMAIL SYSTEM.

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SCHEDULE C

(a) The information in the last full paragraph of the cover page of the Offering Memorandum regarding the delivery of the Notes; and

(b) the information in the eighth paragraph of text under the caption “Plan of Distribution” in the Offering Memorandum concerning stabilization and other transactions.

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SCHEDULE D

Salix Pharmaceuticals, Inc.

Glycyx Pharmaceuticals, Ltd.

InKine Pharmaceutical Company, Inc.

Corbec Pharmaceuticals, Inc.

Sangen Pharmaceutical Company

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SCHEDULE E

1.	Xxxx X. Xxxxxxxx

2.	Xxxxxx X. X’Xxxxxx

3.	Xxxxxxx X. Xxxxxx, Xx.

4.	Xxxxxxx Xxxxxx III

5.	Xxxxxxx X. Xxxxx

6.	Xxxxxxx X. Xxxxx

7.	Xxxx X. Xxxxx

8.	Xxxx X. Derbyshire

9.	Xxxxxxx X. Xxxxxx

10.	Xxxx Xxxxx

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EXHIBIT A-I

[Form of PWC’s Comfort Letter]

A-I-1

EXHIBIT A-II

[Form of E&Y’s Comfort Letter]

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EXHIBIT B

August 8, 0000

Xxxx xx Xxxxxxx Securities LLC

As Representative of the Several Initial Purchasers

c/o Banc of America Securities LLC

Xxx Xxxxxx Xxxx

Xxx Xxxx, XX 00000

Re: Salix Pharmaceuticals, Ltd. (the “Company”)

Ladies and Gentlemen:

The undersigned is an owner of record or beneficially of certain shares of Common Stock of the Company or securities convertible into or exchangeable or exercisable for Common Stock. The Company proposes to carry out an offering of Convertible Senior Notes due 2028, which will be convertible into common stock, $0.001 par value (the “Common Stock”), of the Company (the “Offering”), for which you will act as the representative of the initial purchasers. The undersigned recognizes that the Offering will be of benefit to the undersigned and will benefit the Company. The undersigned acknowledges that you and the other initial purchasers are relying on the representations and agreements of the undersigned contained in this letter in carrying out the Offering and in entering into a purchase agreement with the Company with respect to the Offering.

In consideration of the foregoing, the undersigned hereby agrees that the undersigned will not, (and will cause any spouse or immediate family member of the spouse or the undersigned living in the undersigned’s household not to), without the prior written consent of Banc of America Securities LLC (“BAS”) (which consent may be withheld in its sole discretion), directly or indirectly, sell, offer, contract or grant any option to sell (including without limitation any short sale), pledge, transfer, establish an open “put equivalent position” or liquidate or decrease a “call equivalent position” within the meaning of Rule 16a-1(h) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise dispose of or transfer (or enter into any transaction that is designed to, or might reasonably be expected to, result in the disposition of) including the filing (or participation in the filing of) of a registration statement with the Securities and Exchange Commission in respect of, any shares of Common Stock, options or warrants to acquire shares of Common Stock, or securities exchangeable or exercisable for or convertible into shares of Common Stock currently or hereafter owned either of record or beneficially (as defined in Rule 13d-3 under the Exchange Act) by the undersigned (or such spouse or family member), or publicly announce an intention to do any of the foregoing, for a period commencing on the date hereof and continuing through the close of trading on September 8, 2008, if the Offering has not closed by such date, or otherwise on the date 75 days after the offering date set forth on the final offering memorandum with respect to the Offering (the “Lock-Up Period”). The foregoing sentence shall not apply to (i) the transfer of any or all of

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the shares of Common Stock owned by the undersigned, either during his or her lifetime or on death, by gift, will or intestate succession to the immediate family of the undersigned or to a trust the beneficiaries of which are exclusively the undersigned and/or a member or members of his or her immediate family (for purposes of this agreement, “immediate family” shall mean any relationship by blood, marriage or adoption, not more remote than first cousin) or (ii) any bona fide gifts to any charitable organization; provided, however, that in any such case it shall be a pre-condition to such transfer that (a) the transferee or donee executes and delivers to BAS a lock-up agreement in form and substance satisfactory to BAS, (b) no filing by any party (transferor, transferee, donor or donee) under the Exchange Act shall be required or shall be voluntarily made in connection with such transfer or distribution (other than a filing on a Form 5, Schedule 13D or Schedule 13G (or 13D A or 13G A) made after the expiration of the Lock-Up Period), (c) each party (transferor, transferee, donor or donee) shall not be required by law (including without limitation the disclosure requirements of the Securities Act of 1933, as amended, and the Exchange Act) to make, and shall agree to not voluntarily make, any public announcement of the transfer or disposition and (d) the undersigned notifies BAS at least three business days prior to the proposed transfer or disposition. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of shares of Common Stock or securities convertible into or exchangeable or exercisable for Common Stock held by the undersigned except in compliance with the foregoing restrictions.

This agreement is irrevocable and will be binding on the undersigned and the respective successors, heirs, personal representatives, and assigns of the undersigned.



Printed Name of Holder

By:
		Signature


Printed Name of Person Signing (and indicate capacity of person signing if signing as custodian, trustee, or on behalf of an entity)

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EXHIBIT C

[Form of Second Amendment to the Credit Agreement]

C-4

Document Metadata

Table of Contents

55,000,000 AGGREGATE PRINCIPAL AMOUNT Salix Pharmaceuticals, Ltd. 5.5% CONVERTIBLE SENIOR NOTES DUE 2028 Purchase Agreement dated August 18, 2008

Document Metadata