1. Departments of Chemistry and Earth & Ocean Sciences, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z1, Discovery Oncology, Wyeth Research, 401 Middletown Road, Pearl River, New York 10965, Ross University School of Medicine, Portsmouth, Commonwealth of Dominica, West Indies, and Department of Coelenterates and Porifera, Institute for Systematics and Population Biology, (Zoologisch Museum) University of Amsterdam, P.O. Box 94766, 1090 AT, Amsterdam, The Netherlands