3,4-dimethylbiphenyl-3',4'-dicarboxylic acid dimethyl ester

4-溴邻苯二甲酸二甲酯

3,4-dicarbomethoxybiphenyl-3',4'-dicarboxylic acid

3,4-dimethoxycarbonylcyclohexyl-3′,4′-dimethylbenzene