Agaricinic acid was extracted from the carpophore of Fomitopsis officinalis (Vill. Bond. et Sing). Its structure was established by 1 H and 13 C NMR spectroscopy and comparison to a standard sample (Sigma-Aldrich). The extraction was carried out using ethanol. The obtained extract was evaporated, cooled (-5°C), and purified by ether. The structure of unbranched alkyl radicals was determined using their proton spectrum. The 13 C NMR spectrum and two-dimensional { 13 C, 1 H} correlation diagram showed the presence of a hydroxyl (second quaternary C atom) and three types of carboxy groups (first, second, and third C atoms). The spectrum of the extracted sample is identical to that of the standard sample of agaricinic acid.

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