(R)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-4-methoxy-4-oxobutanoic acid
(S)-2-Acetamido-4-(tert-butoxy)-4-oxobutanoic acid
4-((4-(2-Chlorophenoxy)phenyl)amino)-4-oxobutanoic acid
2-Amino-4-(methylamino)-4-oxobutanoic acid
(S)-3-(((Benzyloxy)carbonyl)amino)-4-(tert-butoxy)-4-oxobutanoic acid
4-Morpholino-4-oxobutanoic acid
3-Benzyl-4-methoxy-4-oxobutanoic acid
4-((4-Ethoxyphenyl)amino)-4-oxobutanoic acid
4-((2,5-Dioxopyrrolidin-1-yl)oxy)-4-oxobutanoic acid
(S)-3-Benzyl-4-methoxy-4-oxobutanoic acid
(S)-3-(((Benzyloxy)carbonyl)amino)-4-methoxy-4-oxobutanoic acid
4-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)-4-oxobutanoic acid
4-(3,4-Dihydroquinolin-1(2H)-yl)-4-oxobutanoic acid
(R)-4-(Benzyloxy)-2-ethyl-4-oxobutanoic acid
(R)-3-Amino-4-methoxy-4-oxobutanoic acid
(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-4-((3-methylpentan-3-yl)oxy)-4-oxobutanoic acid
(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-4-amino-4-oxobutanoic acid
2,4-Diamino-4-oxobutanoic acid
(S)-3-Amino-4-ethoxy-4-oxobutanoic acid
