SAPONINS FROM CARINIANA RUBRA (LECYTHIDACEAE)

three triterpenoidal saponins were isolated from the stem bark of cariniana rubra gardner & miers (lecythidaceae). the saponins reported are monodesmosides and a bidesmoside derivatives from the triterpene 2a ,3b ,23-trihydroxy-12-oleanen-28-oic acid (arjunolic acid). the proposed structures are 28-b -glucopyranosyl-23-o-acetyl arjunolic acid 1, 3-o-b -glucopyranosyl arjunolic acid 2 and 28-o-[ a -rhamnopyranosyl-(1？ 2)-b -glucopyranosyl] -23-o-acetyl arjunolic acid 3. the structures were elucidated mainly from its nmr spectral data. compounds 1 and 3 are described for the first time.