Pyrazine, [2-(3-pyridinyl)ethenyl]-, (E)-

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

(1rs&,3rs&)-3-[(1RS,5RS,6SR)-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.2.0]heptane-3-amido]cyclobutane-1-carboxylic acid

rac-4-{[(1R,5R,6S)-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.2.0]heptan-3-yl]formamido}but-2-ynoic acid

4-{N-ethyl-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexyl]formamido}butanoic acid

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

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

2-[(2S)-1-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanoyl]piperidin-2-yl]acetic acid

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

(2S,3R)-3-(benzyloxy)-2-{[(1RS,5RS,6SR)-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.2.0]heptan-3-yl]formamido}butanoic acid

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