1. Department of Chemistry, M/C
0212, Virginia Tech, Blacksburg, Virginia
24061, United States
2. Missouri Botanical Garden, B.P 3391, Antananarivo 101, Madagascar
3. Centre National d’Application des Recherches Pharmaceutiques, B.P 702, Antananarivo
101, Madagascar
4. Next Generation Systems, Eisai Inc., 4 Corporate Drive, Andover, Massachusetts
01810, United States