1-ethyl-4-{4H,5H,6H,7H-[1,2,3,4]tetrazolo[1,5-a]pyrimidin-7-yl}-1H-pyrazole

2-{N-ethyl-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexyl]formamido}-2-methylpropanoic acid

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

4-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolane-2-carbonyl]morpholine-3-carboxylic acid

4-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolan-2-yl]formamido}-2,2-dimethylbutanoic acid

2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]-3,3,3-trifluoropropanoic acid

2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-3,3,3-trifluoropropanoic acid

2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)but-2-enamido]-3,3,3-trifluoropropanoic acid

2-{[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopropyl]formamido}-3,3,3-trifluoropropanoic acid

(S)-2-Amino-3-cyclopropyl-2-methylpropan-1-ol

2-[({5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,2-oxazol-3-yl}formamido)methyl]-2-methylbutanoic acid