2-[4-(carboxymethyl)-2,5-dioxopiperazin-1-yl]acetic acid

2-[carboxymethyl-[(1-methylbenzimidazol-2-yl)methyl]amino]acetic acid

2-[carboxymethyl(propan-2-yl)amino]acetic acid

(乙酰基-甲氧羰基甲基-氨基)-乙酸甲酯

dimethyl 3,4-diethoxypyrrole-2,5-dicarboxylate