1. GlaxoSmithKline Pharmaceuticals, 1250 South Collegeville Road, Collegeville, Pennsylvania 19426, GlaxoSmithKline Pharmaceuticals, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K., and Department of Pharmaceutical Chemistry, University of CaliforniaSan Francisco, QB3 Building, 1700 4th Street, Box 2550, San Francisco, California 94148