Zopf . produces olivetoric acid and other physodic acids, while var . " furfuracea " produces physodic but not olivetoric acid.
2.
In addition to the physodic acid mentioned above, " P . furfuracea " also contains 2-hydroxy-4-methoxy-3, 6-dimethyl benzoic acid, atranorin, oxyphysodic acid, and virensic acid.
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