it is not fully resolved, it has been postulated that camptothecin is produced from strictosidine via strictosamide, 3 (S)-pumiloside and 3 (S)-deoxypumiloside. References Topoisomerase inhibitors Quinoline alkaloids Tertiary alcohols Delta-lactones Delta-lactams Pyranoindolizinoquinolines Enones Conjugated dienes Plant toxins