Alkaloids of Pterotaberna inconspicua

Abstract Sixteen alkaloids were isolated from the seeds and root-bark of Pterotaberna inconspicua , collected in Zaire. They were voacangine 3-carbonitrile, voacangine, voacristine, 3,6-oxido-voacangine, vobasine, 10-hydroxycoronaridine, 10-hydroxyheyneanine, methuenine, apparicine, tubotaiwine, 16-epi-isositsirikine, 16-epimethuenine, 3,14-dihydroellipticine, an isomer of corynantheol, 16-epimethuenine N -oxide and tetra-hydroellipticine.