1. Department of Pharmaceutical Sciences, College of Pharmacy, University of Hawaii at Hilo, 34 Rainbow Drive, Hilo, Hawaii 96720, Department of Chemistry and Biochemistry, University of Minnesota, Duluth, Minnesota 55812, Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, and Department of Microbiology and Immunology, Life Sciences Institute, 2350 Health Sciences Mall, University of British Columbia, Vancouver, B.C., Canada V6T 1Z3