2-{[(tert-butoxy)carbonyl]amino}-4-(1H-1,2,3,4-tetrazol-5-yl)butanoic acid

3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]methyl}-2,2-difluorocyclopropane-1-carboxylic acid

2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]methyl}cyclopropane-1-carboxylic acid

2-{[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]methyl}cyclopropane-1-carboxylic acid

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-{methyl[(thietan-3-yl)methyl]carbamoyl}propanoic acid

3-[(3-cyano-5-fluorophenyl)carbamoyl]-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2R)-1-{4-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1-methyl-1H-pyrazole-5-carbonyl}pyrrolidine-2-carboxylic acid

(2R)-2-({4-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1-methyl-1H-pyrazol-5-yl}formamido)-3-hydroxypropanoic acid

(1R,5S)-3-[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridine-2-carbonyl]-3-azabicyclo[3.1.0]hexane-6-carboxylic acid

rac-(1R,2S)-2-({2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]butanamido}methyl)cyclohexane-1-carboxylic acid

1-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolane-2-carbonyl}-3-methylazetidine-3-carboxylic acid