3-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanoyl]-3-azabicyclo[3.1.0]hexane-1-carboxylic acid

(2S,3R)-2-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]-3-hydroxybutanoic acid

rac-(1R,2S)-2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hex-4-ynamido]cyclohexane-1-carboxylic acid

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

5-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hex-4-ynamido]methyl}furan-2-carboxylic acid

2-{1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hex-4-ynoyl]-4-methylpyrrolidin-3-yl}acetic acid

2-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-3,3,3-trifluoropropanamido}hex-4-ynoic acid

2-[(2S)-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluorobutanoyl]pyrrolidin-2-yl]acetic acid

2-[(2S)-1-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanoyl]pyrrolidin-2-yl]acetic acid

2-[(2S)-1-[(1RS,2SR)-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopentanecarbonyl]pyrrolidin-2-yl]acetic acid

2-[(2S)-1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)benzoyl]pyrrolidin-2-yl]acetic acid