1. Department of Medicinal Chemistry; University of Florida; 1345 Center Drive Gainesville FL 32610 USA
2. Center for Natural Products; Drug Discovery and Development (CNPD3); University of Florida; 1345 Center Drive Gainesville FL 32610 USA
3. Department of Pharmaceutical Chemistry; Faculty of Pharmacy; Kuwait University; P.O. Box 24923 Safat 13110 Kuwait
4. Smithsonian Marine Station; 701 Seaway Drive Fort Pierce FL 34949 USA