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J. J. Vittal, S.-G. Cao, S.-H. Goh, G.-K. Tan and K.-Y. Sim.
Three Novel Isomeric Pyranocoumarins from Calophyllum teysmannii: Calanone, Isocalanone and Teysmanone A
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Acta Cryst. (1998). C54, 1536-1540Â Â Â Â
[DOI: 10.1107/S0108270198005691]