Abstract
Two structurally related sesquiterpenoid metabolites, complicatie acid and hirsutic acid C, have been produced separately as the principal terpenoid metabolic products in stirred fermentations of Stereum complicatum (Fr.) Fr. in which the pH value was, respectively, controlled at 5·0 or allowed to fall to 2·4. The identity of complicatie acid with both hirsutic acid N and ramealin, uncharacterized fungal metabolites first observed more than 25 years previously and (including hirsutic acid C) since unobtainable, is suggested. These metabolites have the same ‘hirsutane’ carbon skeleton as the coriolin group of basidiomycete sesquiterpenes.
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