Methyl 3-ethynyl-1-[(2-methylpropan-2-yl)oxycarbonylamino]cyclobutane-1-carboxylate

4-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]cyclopent-1-ene-1-carboxylic acid

2-(N-benzyl-1-{1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)phenyl]cyclopropyl}formamido)acetic acid

4-(2-{1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}acetamido)-2-methylbut-2-enoic acid

1-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanoyl]-4-methoxypyrrolidine-3-carboxylic acid

(3R)-3-(2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)ethyl]sulfanyl}acetamido)pentanoic acid

3-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-1,3-thiazolidine-4-carboxylic acid

2-{2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1,3-thiazol-4-yl]acetyl}-2-azabicyclo[2.1.1]hexane-1-carboxylic acid

2-{2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentyl]acetyl}-2-azabicyclo[2.1.1]hexane-1-carboxylic acid

3-[(3R)-N-ethyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]-2-methylpropanoic acid

5-chloro-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbut-2-enamido]benzoic acid