2-[(2,4-二氧代-1-咪唑烷基)亚氨基]乙酸

3-methyl-4-oxopent-2-enoic acid

2-[carboxymethyl(formyl)amino]acetic acid

2-(3-chloro-4-hydroxyphenyl)-2-hydroxyacetic acid

2-(diphenylhydrazinylidene)acetic acid