2-Carbomethoxy-6-methoxyxanthone 6-Methoxy-9-oxo-9H-xanthene-2-carboxylic acid methyl ester 9H-xanthene-2-carboxylic acid, 6-methoxy-9-oxo-, methyl ester InChI=1/C16H12O5/c1-19-10-4-5-11-14(8-10)21-13-6-3-9(16(18)20-2)7-12(13)15(11)17/h3-8H,1-2H methyl 6-methoxy-9-oxo-9H-xanthene-2-carboxylate