The structure suggested for cercosporin, a naturally occurring dihydroxy-perylenequinone, is unusual in having a methylenedioxy-group present in a seven-membered ring bridging a biphenyl system.
R. J. J. Ch. Lousberg, U. Weiss, C. A. Salemink, A. Arnone, L. Merlini and G. Nasini, J. Chem. Soc. D, 1971, 1463 DOI: 10.1039/C29710001463
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