Isostrychnopentamine, an indolomonoterpenic alkaloid from Strychnos usambarensis, with potential anti-tumor activity against apoptosis-resistant cancer cells. - Saidou Balde el,H.; Megalizzi,V.; Cao,M.; Angenot,L.; Kiss,R.; Van Damme,M.; Frederich,M. (Int J Oncol, 2010)