ethyl 4-bromo-3-methyl-1H-pyrrole-2-carboxylate

3-methyl-pyrrole-2,5-dicarboxylic acid-2-ethyl ester

4-溴-3,5-二甲基-1H-吡咯-2-羧酸乙酯

3-甲基-吡咯-2,5-二羧酸二乙酯

3-bromo-4-methyl-pyrrole-2,5-dicarboxylic acid-5-ethyl ester