$1,000 Uses in Right to Sell Clause

Right to Sell from Put Option Agreement

This Amended and Restated Put Option Agreement (this Agreement), dated as of February 12, 2015, is by and between DSHC, LLC (f/k/a Darkstone, LLC), a Delaware limited liability company (the Company), and [] (the Optionee).

Right to Sell. Subject to the terms and conditions of this Agreement, after the occurrence of the Put Trigger Event and until the ninetieth (90th) day following the date on which the Optionee receives written notice of the occurrence of (and setting forth the details of) such Put Trigger Event, the Optionee shall have the right (the Put Right), but not the obligation, to cause the Company to purchase any or all of the Shares then held by the Optionee (other than any Shares that have been redeemed and for which Rentech has paid the Redemption Price of such Shares on the Redemption Date pursuant to the Articles of Amendment) (the Put Shares) from the Optionee for a price per Share (the Put Purchase Price) equal to (i) $1,000 per Share (as adjusted for any stock splits, stock dividends, recapitalizations or similar transaction with respect to the Preferred Stock), plus (ii) all accrued and unpaid dividends on such Share (whether or not declared and including all amounts accrued since the last Dividend Payment Date (as defined in the Articles of Amendment)) through and including the date of the Put Exercise Notice (as defined below).

Right to Sell from Put Option Agreement

This Put Option Agreement (this Agreement), is made and entered as of April 9, 2014, by and between Darkstone, LLC, a Delaware limited liability company (the Company), and [GSO] (the Optionee).

Right to Sell. Subject to the terms and conditions of this Agreement, after the occurrence of the Put Trigger Event and until the ninetieth (90th) day following the date on which the Optionee receives written notice of the occurrence of (and setting forth the details of) such Put Trigger Event, the Optionee shall have the right (the Put Right), but not the obligation, to cause the Company to purchase any or all of the Shares then held by the Optionee (other than any Shares that have been redeemed and for which Rentech has paid the Redemption Price of such Shares on the Redemption Date pursuant to the Articles of Amendment) (the Put Shares) from the Optionee for a price per Share (the Put Purchase Price) equal to (i) $1,000 per Share (as adjusted for any stock splits, stock dividends, recapitalizations or similar transaction with respect to the Preferred Stock), plus (ii) all accrued and unpaid dividends on such Share (whether or not declared and including all amounts accrued since the last Dividend Payment Date (as defined in the Articles of Amendment) through and including the date of the Put Exercise Notice (as defined below).