4-((4-Ethoxyphenyl)amino)-4-oxobutanoic acid
4-((4-Boronophenyl)amino)-4-oxobutanoic acid
4-Oxo-4-((4-sulfamoylphenyl)amino)butanoic acid
4-((4-Hydroxyphenyl)amino)-4-oxobutanoic acid
4-Oxo-4-(phenylamino)butanoic acid
N-(4-chlorophenyl)succinamic acid
4-((3-Boronophenyl)amino)-4-oxobutanoic acid
