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Chan, K.C. (1968) Gambirdine and isogambirdine, the alkaloids from uncaria gambir (hunt) roxb. Tetrahedron Letters, 9 (30). pp. 3403-3406. ISSN 0040-4039, DOI https://doi.org/10.1016/S0040-4039(00)89504-0.
Carrick, John and Chan, K.C. and Cheung, H.T. (1968) A New Phytochemical Survey of Malaya-Chemical Screening. Chemical and Pharmaceutical Bulletin, 16 (12). pp. 2436-2441. ISSN 0009-2363, DOI https://doi.org/10.1248/cpb.16.2436.