Abstract

An ethanol extract of Lactarius vellereus contained a new 5-hydroxy-lactara-6,8-dien-13-oic acid γ-lactone in addition to known sesquiterpenes. The structure of the new compound was established by 1H and 13CNMR spectroscopy. An unambiguous assignment of stereochemistry at C-3 of this compound was accomplished by independent synthesis of both C-3 epimers.

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