The separation of lanostane-typetriterpeneacids carrying an acetoxylgroupfromsclerotia of Poriacocos (hoelen) was effectively achieved by means of preparative HPLC of the phthalimidomethyl esters followed by selective hydrolysis of the phthalimidomethyl ester groupings. By this method, three new triterpeneacids were isolated together with pachymic and dehydropachymic acids, which are characteristic