Abstract
AbstractMarginalin [(E)‐1 or (Z)‐2] is rearranged by bases to the strongly fluorescent 5‐hydroxy‐2‐(4′‐hydroxyphenyl)‐3‐benzo[b]furancarboxylic acid (3) or to methyl 5‐hydroxy‐2‐(4′‐hydroxyphenyl)‐7‐methoxy‐3‐benzo[b]furancarboxylate (4).
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