Apetalactone, a new triterpene lactone isolated from Calophyllum apetalum Willd. and C. tomentosum T. Anders., has been shown to be 4,28-dihydroxy-3,4-secofriedelan-3-oic acid lactone (IIa).
T. R. Govindachari, D. Prakash and N. Viswanathan, J. Chem. Soc. C, 1968, 1323 DOI: 10.1039/J39680001323
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