The structures of two new triterpene acids isolated from Phellinus pomaceus have been determined by a combination of chemical and physical methods and confirmed by X-ray crystallographic analysis of one of their methylated derivatives. The compounds were identified as 4β,14α-dimethyl-3-nor-5α-pregn-8-ene-4α,20α-dicarboxylic acid and 4β, 14α-dimethyl-20-oxo-3-nor-5α-pregn-8-ene-4α-carboxylic acid.
A. G. González, J. B. Barrera, M. J. M. Pérez, F. J. T. Marante and A. Perales, J. Chem. Soc., Perkin Trans. 1, 1986, 551 DOI: 10.1039/P19860000551
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