4-马来酰亚胺基马尿酸

3-[[4-(羧甲基氨基甲酰)苯基]氨基甲酰]丙-2-烯酸

2-[(4-cyanobenzoyl)amino]acetic acid

2-[[4-(phenylcarbamothioylamino)benzoyl]amino]acetic acid