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Sordidone (IV) and thiophanic acid (XVI) are two metabolites isolated from the lichen Lecanora rupicola. Chlorination of 5,7-dihydroxy-2,6-dimethylchromone (III) with sulphuryl chloride gives sordidone. Condensation of dichloroeverninic acid (XIII) with phloroglucinol gave the xanthone (XIV), which by chlorination followed by demethylation, gave thiophanic acid (XVI).
M. Arshad, J. P. Devlin and W. D. Ollis, J. Chem. Soc. C, 1971, 1324 DOI: 10.1039/J39710001324
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