1,2-Dibenzofurandicarboxylic acid, 3,9b-dihydro-7,9-dimethoxy-4,9b-dim ethyl-, dimethyl ester;3,9b-Dihydro-7,9-dimethoxy-4,9b-dimethyl-1,2-dibenzofurandicarboxylic acid dimethyl ester
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