5,6-Dihydro-1,2,3,10-tetramethoxybenzo(a)heptalene-7,9-dione;Benzo(a)heptalene-7,9-dione, 5,6-dihydro-1,2,3,10-tetramethoxy-;benzo[a]heptalene-7,9-dione, 5,6-dihydro-1,2,3,10-tetramethoxy-
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