1 EXHIBIT 10.18 SYNTHETIC COMPOUND PURCHASE AGREEMENT This Synthetic Compound Purchase Agreement ("Agreement"), is effective as of June 25, 1997 ("Effective Date"), by and between Microcide Pharmaceuticals, Inc. ("Microcide"), a Delaware corporation,...Synthetic Compound Purchase Agreement • August 14th, 1997 • Microcide Pharmaceuticals Inc • Pharmaceutical preparations • California
