9,10-Ethenoanthracene-11,12-dicarboxylic acid, 9,10-dihydro-, dimethyl ester;Tetracyclo[6.6.2.0(2,7).0(9,14)]hexadeca-2,4,6,9,11,13,15-heptaene-15,16-dicarboxylic acid, dimethyl ester
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