Phytochemical investigation of Tabernaemontana crassa. Journal of ethnopharmacology January 1, 1985 T A Van Beek, C De Smidt, R Verpoorte 18 citations Ibogaine, the major alkaloid isolated from the stembark of Tabernaemontana crassa, showed antibacterial activity against the gram-positive bacterium Bacillus subtilis. Conopharyngine was also identified as a minor compound in the plant. DOI: 10.1016/0378-8741(85)90096-0 Full text