1. Drug Discovery Program, Institute of Cognitive and Computational Sciences, Georgetown University Medical Center, 3970 Reservoir Road, NW, Washington, D.C. 20007-2197, Department of Pharmacology, NEOUCOM, Rootstown, Ohio 44272, Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, Texas 77555-1031, Laboratory for the Structure of Matter, Code 6030, Naval Research Laboratory, 4555 Overlook SW, Washington, D.C. 20375-5000, and Helios Pharmaceuticals, 9800 Bluegrass...