(1)Benzopyrano(5,4,3-cde)(1)benzopyran-5,10-dione, 2,7-dihydroxy-3,8-dimethoxy-;[1]benzopyrano[5,4,3-cde][1]benzopyran-5,10-dione, 2,7-dihydroxy-3,8-dimethoxy-;2,7-Dihydroxy-3,8-dimethoxychromeno[5,4,3-cde]chromene-5,10-dione
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