EXHIBIT 4.1 STOCK PURCHASE AGREEMENT Pharmacopeia, Inc. CN 5350 Princeton, NJ 08543-5340 The undersigned (the "Investor"), hereby confirms its agreement with you as follows: 1. This Stock Purchase Agreement (the "Agreement") is made as of the date set...Stock Purchase Agreement • April 11th, 2000 • Pharmacopeia Inc • Services-commercial physical & biological research • Delaware
