3,8-Dihydroxy-4,6-dimethoxy-9-oxo-9H-xanthene-1-carboxylic acid methyl ester 8-Carboxymethyl-1,6-dihydroxy-3,5-dimethoxyxanthone 9H-xanthene-1-carboxylic acid, 3,8-dihydroxy-4,6-dimethoxy-9-oxo-, methyl ester InChI=1/C17H14O8/c1-22-7-4-9(18)13-11(5-7)25-16-12(14(13)20)8(17(21)24-3)6-10(19)15(16)23-2/h4-6,18-19H,1-3H methyl 3,8-dihydroxy-4,6-dimethoxy-9-oxo-9H-xanthene-1-carboxylate