(3'S)-[1,3'-bipiperidin]-2-one hydrochloride

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

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

3-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanamido]-2-methylbutanoic acid

2-[(2R)-1-{3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]pentanoyl}piperidin-2-yl]acetic acid

4-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-3,3,3-trifluoropropanoyl}thiomorpholine-3-carboxylic acid

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

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

rac-(1R,5R,6S)-6-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanamido]bicyclo[3.2.0]heptane-3-carboxylic acid

3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N,4,4-trimethylpentanamido]-2-methylpropanoic acid

(2S)-4-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanamido]-2-hydroxybutanoic acid