1. Department
of Chemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0212, Blacksburg, Virginia 24061, United States
2. Department
of Biochemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0308, Blacksburg, Virginia 24061, United States
3. Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166, United States
4. Missouri Botanical Garden, Lot
VP 31 Ankadibevava, Anjohy Antananarivo 101, Madagascar
5. Centre National d’Application des Recherches Pharmaceutiques, B.P. 702, Antananarivo 101, Madagascar