1. Departments of Chemistry and Earth & Ocean Sciences, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z1, Department of Biochemistry & Molecular Biology, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z3, Ross University School of Medicine, Portsmouth, Commonwealth of Dominica, and Department of Coelenterates and Porifera (Zoologisch Museum), University of Amsterdam, Amsterdam, The Netherlands