3-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1-methyl-1H-pyrazol-3-yl]formamido}-2-methylbutanoic acid

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

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-{methyl[2-methyl-2-(methylcarbamoyl)ethyl]carbamoyl}propanoic acid

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)benzoyl]piperidine-4-carboxylic acid

5-({2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-2-methylbutanamido}methyl)-1,2-oxazole-3-carboxylic acid

3-{2-ethyl-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]butanamido}oxolane-2-carboxylic acid

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

1-({2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetamido}methyl)cyclopentane-1-carboxylic acid

1-{2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetyl}azepane-2-carboxylic acid

2-{N-cyclopentyl-2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetamido}acetic acid

rac-(1R,3S)-3-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylpentanamido]methyl}-2,2-difluorocyclopropane-1-carboxylic acid