1H,10H-Pyrano[4,3-b][1]benzopyran-9-carboxylicacid, 3,4-dihydro-3,7,8-trihydroxy-3-methyl-10-oxo- (6CI);3,4-Dihydro-3,7,8-trihydroxy-3-methyl-10-oxo-1H,10H-pyrano(4,3-b)(1)benzopyran-9-carboxylic acid;
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