1. Department of Chemical Process Development, Pharmaceutical Research Institute, Bristol-Myers Squibb Co., P.O. Box 191, New Brunswick, New Jersey 08903-0191, Department of Solid State Chemistry, Pharmaceutical Research Institute, Bristol-Myers Squibb Co., P.O. Box 4000, Princeton, New Jersey 08543-4000, and Chemical Process Research, Bristol-Myers Squibb Co., 100 Boulevard de l'Industrie, Candiac, Quebec, J5R 1J1 Canada