(1,1'-Biphenyl)-3,3'-dicarboxylic acid, 4,4'-diamino-, dimethyl ester 15403-45-9 3,3'-Dicarbomethoxybenzidine BRN 2760702 CCRIS 6583 Dimethyl 4,4'-diamino-(1,1'-biphenyl)-3,3'-dicarboxylate