A triterpenoid dimethyl ester ε-lactone isolated from dammar resin has been shown by X-ray crystallographic examination to be 23-hydroxy-2,3-secours-12-ene-2,3,28-trioic acid (2 → 23)-lactone 3,28-dimethyl ester (IV): it is probably formed biogenetically by oxidation of asiatic acid (II).
S. Brewis, T. G. Halsall, H. R. Harrison and O. J. R. Hodder, J. Chem. Soc. D, 1970, 891 DOI: 10.1039/C29700000891
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