6-methyl-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazine-3-carbonyl chloride

(1RS,6SR)-2-[(1RS&,2SR&)-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropanecarbonyl]-2-azabicyclo[4.1.0]heptane-1-carboxylic acid

rac-(1R,6S)-2-{2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetyl}-2-azabicyclo[4.1.0]heptane-1-carboxylic acid

2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanoyl]-2-azabicyclo[4.1.0]heptane-1-carboxylic acid

rac-(2R,4R)-1-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanoyl]-2-methylpiperidine-4-carboxylic acid

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

2-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanoyl]-2-azabicyclo[2.1.1]hexane-5-carboxylic acid

5-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanoyl]-5-azaspiro[2.4]heptane-7-carboxylic acid

4-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]cyclopent-1-ene-1-carboxylic acid

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

(3S)-3-[(2S)-3-(benzyl carboxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]hexanoic acid