Marasmane lactones from Lactarius vellereus

Abstract An ethanol extract of Lactarius vellereus gave 7α,8α,13-trihydroxy-marasm-5-oic acid γ-lactone and 13-hydroxy-marasm-7(8)-en-5-oic acid γ-lactone in addition to known compounds. The structure of the dihydroxylactone was established by spectroscopy and confirmed by single crystal X-ray diffraction. The structure of the unsaturated lactone was substantiated by spectroscopy and transformation to the former dihydroxylactone.