1. Departments of Chemistry, Earth & Ocean Sciences, Biochemistry & Molecular Biology, and Cellular & Physiological Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1; Institute for Systematics and Ecology, University of Amsterdam, 1090 GT Amsterdam, The Netherlands; and Discipline of Pharmacology, School of Medicine and Health Sciences, University of Papua New Guinea, N.C.D., Papua New Guinea