A phytochemical study on the bark of Neisosperma oppositifolia (Apocynaceae) yielded two new beta-carboline indole alkaloids, oppositinines A (1) and B (2), together with five known alkaloids, isoreserpiline, isocarapanaubine, vobasine, 10-methoxydihydrocorynantheol-N-oxide, and ochropposinine
Ochrosia elliptica cell suspension cultures were obtained from callus cultures using an original «cell washing technique». These suspensions accumulated ellipticine, 9-methoxyellipticine, elliptinine, isoreserpiline, and reserpiline (a new alkaloid for this species) during the stationary growth