1. Organic Chemistry Department, Southern Research Institute, Birmingham, Alabama 35255, Clinical Psychopharmacology Section, IRP, National Institute on Drug Abuse, Baltimore, Maryland 21224, Department of Pharmacology, College of Medicine, The University of Arizona Health Sciences Center, Tucson, Arizona 85724, and Department of Pharmacology, University of New England College of Osteopathic Medicine, Biddeford, Maine 04005