1. Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, Conservation International Suriname, Kromme Elleboogstraat No. 20, Paramaribo, Suriname, The National Herbarium of Suriname, P.O. Box 9212, Paramaribo, Suriname, Bedrijf Geneesmiddelen Voorziening Suriname, Commissaris Roblesweg 156, Geyersvlijt, Suriname, and Centre National d'Application et Recherches Pharmaceutiques, B.P. 702, Antananarivo 101, Madagascar