4-(carboxymethylamino)-4-oxobutanoic acid

N-(4-羧基苯基)琥珀酰胺酸

4-(3-carboxypropanoylamino)-2-hydroxybenzoic acid

4-[4-(4-chlorophenoxy)phenyl]-4-oxobutanoic acid

4-(2-aminoethylamino)-4-oxobutanoic acid