67801-59-6 6H-Dibenzo(b,d)pyran-4,8-dicarboxylic acid, 6-oxo-, dimethyl ester Dimethyl 6-oxo-6H-dibenzo(b,d)pyran-4,8-dicarboxylate Dimethyl 6-oxo-6H-dibenzopyran-4,8-dicarboxylate EINECS 267-179-7