Abstract
Degradative and spectroscopical evidence, as well as biogenetic considerations led to the conclusion that thelephoric acid is 2,3,8,9-tetrahydroxybenzobis[1,2-b,4,5-b′]benzofuran-6,12-quinone(VI). This view was confirmed by synthesis, involving condensation of chloranil with two molecules of 3,4-dimethoxyphenol and subsequent demethylation.
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