Constituents of the Lichen in the Genus Hypogymnia. I. Oxyphysodic Acid a New Depsidone from Hypogymnia enteromorpha (ACH.) NYL.

Abstract

A new depsidone named oxyphysodic acid (2), which has been known to occur often concomitantly with physodic acid (1) in the lichen belonging to the genus Hypogymnia (Parmeliaceae) and also in the lichen of several other species, has been isolated from the lichen Hypogymnia enteromorpha (ACH.) NYL. The structure (2) possessing the pyrogalloltype oxygenation pattern has been established for oxyphysodic acid on the basis of chemical and physicochemical evidence.