3-ethoxycarbonyl-4-methyl-1H-pyrrole-2-carboxylic acid

4-甲基吡咯-3-甲酸乙酯

4-(乙氧基羰基)-3-甲基-1H-吡咯-2-羧酸

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

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