1H,4H-Furo(3,4-c)furan-1,4-dione, 3,6-bis(3,4-dihydroxyphenyl)tetrahydro-;1H,4H-furo[3,4-c]furan-1,4-dione, 3,6-bis(3,4-dihydroxyphenyl)tetrahydro-
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