Ethyl 5-benzyl-6-oxo-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-3-carboxylate

2-{1-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-3-oxopiperazin-2-yl}acetic acid

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

2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]-2-(1-methyl-1H-pyrazol-5-yl)acetic acid

2-cyclobutyl-3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]propanoic acid

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

2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methoxybutanoyl]-4-methyl-2-azabicyclo[2.1.1]hexane-1-carboxylic acid

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

4-[(5-ethyloxolan-3-yl)(methyl)carbamoyl]-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

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

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