1. Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U.P.R. Station, San Juan, Puerto Rico 00931-3346, Department of Pharmacology, Chicago College of Osteopathic Medicine, Midwestern University, 555 31st Street, Downers Grove, Illinois 60515, Department of Systematic Biology & Laboratories of Analytical Biology, Smithsonian Institution, P.O. Box 37012, Washington, D.C. 20013-7012, and Instituto de Investigaciones Científicas Avanzadas y Servicios de Alta Tecnología, Centro de Estudios...