1-(2,2-Dimethylcyclopropyl)-3,3-diethoxypropan-1-one

2-{[(benzyloxy)carbonyl]amino}-3-(4,5-dimethyl-1H-imidazol-1-yl)propanoic acid

1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-4-methylpentanoyl}-3-methylpyrrolidine-2-carboxylic acid

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

2-[3-cyclopentyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-methylpropanamido]-2-methylpropanoic acid

(2S)-3-cyclopropyl-2-{[(2RS,3SR)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolan-2-yl]formamido}propanoic acid

3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]bicyclo[3.1.0]hexane-1-carboxylic acid

3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3,3-trifluoropropanamido]bicyclo[3.1.0]hexane-1-carboxylic acid

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

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolane-3-carbonyl]-3,4-dimethylpyrrolidine-3-carboxylic acid

rac-(3R,4R)-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentanecarbonyl]-3,4-dimethylpyrrolidine-3-carboxylic acid