1. Department of Chemistry, Georgia State University, P.O. Box 4098, Atlanta, Georgia 30302-4098, Department of Chemistry, Emory University, Atlanta, Georgia 30322, Trilink Biotechnologies, Inc., 9955 Mesa Rim Road, San Diego, California 92121, and ChemCyte Inc., 4206 Sorrento Valley Boulevard, Suite A, San Diego, California 92121