3-(4-acetyl-5-methyl-1H-pyrrol-3-yl)propanoic acid

4-(2-羧基-乙基)-2-甲基-1H-吡咯-3-羧酸乙酯

琥珀半醛-2,4-二硝基苯腙

4-oxo-5-acetylaminopentanoic acid