3-(4-methyl-1H-pyrrol-3-yl)propanoic acid

2,5-dicarboxy-3-methyl-1H-pyrrole-4-propanoic acid ethyl ester

(E)-3-(5-ethoxycarbonyl-2,4-dimethyl-1H-pyrrol-3-yl)prop-2-enoic acid

4-(2-羧基-乙基)-3,5-二甲基-1H-吡咯-2-羧酸乙酯

2,4-二甲基-5-乙氧羰基-3-吡咯丙酸乙酯