Camptothecin (CPT),11. Wall , ME , Wani , MC , Cook , CE , Palmer , KH , McPhail , AT and Sim , GA 1966. Plant antitumor agents. The isolation and structure of camptothecin, a novel alkaloidal leukemia and tumor inhibitor from Camptotheca acuminata. J. Am. Chem. Soc., 88(16): 3888–3890. [CrossRef], [Web of Science ®] View all references a pentacyclic alkaloid isolated from the Chinese tree Camptotheca acuminata by Wall et al. in 1966, was shown to have ...