benzyl 3,4-dimethyl-1H-pyrrole-2-carboxylate

3,4-二甲基-1H-吡咯-2-羧酸乙酯

benzyl 4,5-dimethyl-1H-pyrrole-3-carboxylate

3,4,5-三甲基吡咯-2-甲基乙酯

5-ethoxycarbonyl-3,4-dimethyl-1H-pyrrole-2-carboxylic acid