6-(2-Pyridinylamino)-4-pyrimidinecarboxylic acid

tert-butyl 4-(1H-imidazol-5-yl)pyrrolidine-3-carboxylate

tert-butyl 4-(1-methyl-1H-pyrazol-5-yl)pyrrolidine-3-carboxylate

Tert-butyl 4-(5-bromopyridin-2-yl)pyrrolidine-3-carboxylate

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

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

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

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

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

1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolane-2-carbonyl]-3-(prop-2-en-1-yl)azetidine-3-carboxylic acid

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