Vulp in ic acid

CIgH12O5, Mr 308.29, orange prisms, mp. 216- 217 °C. A pigment of numerous lichens. The biosynthesis proceeds from polyporic acid. The methyl ester of R, vulp(in)ic acid, is a typical lichen acid. Hydroxylated P. derivatives are important mushroom pigments, e. g., gomphidic acid, variegatic acid, and xerocomic acid the latter two compounds are responsible for the typical blue color reaction of many Boletus and Xero-comus species on bruising the fruit bodies. 

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