| absolute configuration and complete assignment of 13c nmr data for new sesquiterpenes from maytenus chiapensis. | five new dihydro-beta-agarofuran sesquiterpenes (1-5) were isolated from the leaves of maytenus chiapensis. the structures of 1-5 were determined by means of 1d and 2d nmr techniques. a semiselective hmbc technique was applied in order to obtain complete (13)c nmr assignments. absolute configurations were determined by cd studies and chemical correlations and on biogenetic grounds. compound 4 showed weak activity against a multidrug-resistant leishmania tropica line. | 2003 | 12713421 |