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Wright, C. W.; Allen, D.; Cai, Ya; Phillipson, J. D.; Said, I. M.; Kirby, G. C.; Warhurst, D. C. (June 1992). "In vitro antiamoebic and antiplasmodial activities of alkaloids isolated from Alstonia angustifolia roots". Phytotherapy Research. 6 (3): 121–124. doi:10.1002/ptr.2650060303. S2CID86802484.