1. Department of Chemistry and
Virginia Tech Center for Drug Discovery, M/C 0212, Virginia Tech, Blacksburg, Virginia 24061, United States
2. Department of Biochemistry and
Virginia Tech Center for Drug Discovery, M/C 0308, Virginia Tech, Blacksburg, Virginia 24061, United States
3. Missouri Botanical Garden, B.P 3391, Antananarivo 101, Madagascar
4. Centre National d’Application des Recherches Pharmaceutiques,
B.P 702, Antananarivo 101, Madagascar
5. Department of Chemistry and
Lombardi Cancer Center, Georgetown University, 37th and O Streets NW, Washington, D.C. 20057, United States