The structure of the lichen depsidone variolaric acid (1) advanced by Nolan in 1943 is unique among depsidones in possessing the diaryl ether linkage ortho to the hydroxy-group in ring B. Spectroscopic evidence and the synthesis of a degradation product have confirmed the originally assigned structure.
N. M. Rana, M. V. Sargent and J. A. Elix, J. Chem. Soc., Perkin Trans. 1, 1975, 1992 DOI: 10.1039/P19750001992
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