Exhibit 4.1 STOCK PURCHASE AGREEMENTStock Purchase Agreement • March 11th, 1997 • Cadus Pharmaceutical Corp • Services-commercial physical & biological research • New York
Exhibit 4.2 REGISTRATION RIGHTS AGREEMENT THIS AGREEMENT is made and entered into as of this 25th day of February, 1997 between Cadus Pharmaceutical Corporation, a Delaware corporation (the "Issuer") and SmithKline Beecham Corporation, a Pennsylvania...Registration Rights Agreement • March 11th, 1997 • Cadus Pharmaceutical Corp • Services-commercial physical & biological research • New York
RESEARCH COLLABORATION AND LICENSE AGREEMENT BETWEEN CADUS PHARMACEUTICAL CORPORATION AND SMITHKLINE BEECHAM DATED AS OF FEBRUARY 25th, 1997Cadus Pharmaceutical Corp • March 11th, 1997 • Services-commercial physical & biological research • New York
