Three new isoflavanones, named (3R)-5,7,2',3'-tetrahydroxy-4'-methoxy- 5'-prenylisoflavanone, (3R)-7,2',3'-trihydroxy-4'-methoxy-5'- prenylisoflavanone and (3S)-3,7,2',3'-tetrahydroxy-4'-methoxy-5'- prenylisoflavanone were isolated from the stembark of Geoffroea decorticans. The structures were confirmed by means of spectral analysis including 2D-NMR techniques.
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The authors are grateful to the Guarani communities of the Izozog (Bolivia) as well as M. Sauvain (ORSTOM) for their collaboration during the ethnobotanic work. Part of this work was financially supported by CIRIT-CICYT (project QFN95-4711) and the Comissionat per Universitats i Recerca de la Generalitat de Catalunya. The authors are also grateful for the financial support provided by the Programa de Cooperación Cientı́fica con Iberoamérica.