2,3,5-三甲基-4-吡咯羧酸乙酯

ethyl 2,3,5-trimethyl-1H-pyrrole-1-carboxylate

乙基2,3,5-三甲基-2H-吡咯-2-羧酸酯

ethyl 2,3,5-trimethyl-3H-pyrrole-3-carboxylate

ethyl 4,5-dimethyl-2-methylene-3,4-dihydro-2H-pyrrole-4-carboxylate