Joint Occurrence of a Lichen Depsidone and Its Probable Depside Precursor

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Science  17 Jan 1964:
Vol. 143, Issue 3603, pp. 255-256
DOI: 10.1126/science.143.3603.255


A chemical race of the lichen Cetraria ciliaris Ach., known to produce the depside olivetoric acid, contains the corresponding depsidone, physodic acid, as well. Physodic acid may form by an intramolecular coupling of olivetoric acid.