4-Amino-4-(4-{[(tert-butoxy)carbonyl]amino}-2-chlorophenyl)butanoic acid

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-{methyl[3-(propan-2-yloxy)propyl]carbamoyl}propanoic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-{[(3-methyl-1,2-oxazol-4-yl)methyl]carbamoyl}butanoic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-{[(5-methyloxolan-2-yl)methyl]carbamoyl}butanoic acid

3-[(1-benzyl-3-methylpiperidin-4-yl)carbamoyl]-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

3-[(1-benzyl-5-methylpyrrolidin-3-yl)carbamoyl]-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2S,4S)-1-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopropyl]acetyl}-4-hydroxypyrrolidine-2-carboxylic acid

(2S)-2-({1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}formamido)-3-methoxypropanoic acid

(2S)-2-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetamido}-3-methoxypropanoic acid

(2S)-2-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolan-3-yl]formamido}-3-methoxypropanoic acid

(2S)-2-[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]-3-methoxypropanoic acid