N-[2-(3,4-dimethoxyphenyl)ethyl]-2-{3-oxo-8-phenoxy-2H,3H-[1,2,4]triazolo[4,3-a]pyrazin-2-yl}acetamide

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

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

1-benzyl-3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1-methyl-1H-pyrazole-5-amido]pyrrolidine-3-carboxylic acid

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

rac-(1R,2S)-2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(thiophen-2-yl)acetamido]cyclopentane-1-carboxylic acid

rac-(1R,2S)-2-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,3-thiazole-4-amido}cyclopentane-1-carboxylic acid

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

(3S)-3-[3-cyclopentyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]pentanoic acid

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

1-benzyl-4-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanamido]piperidine-4-carboxylic acid