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Harrigan, G. G., Gunatilaka, A. A. L., Kingston, D. G. I., Chan, G. W., Johnson, R. K. 1994. Isolation of Bioactive and Other Oxoaporphine Alkaloids From Two Annonaceous Plants, Xylopia aethiopica and X. muliusa cf. banacea. J Natural Products, 57: 68-73.