1-{[6-oxo-3-(thiophen-2-yl)pyridazin-1(6H)-yl]acetyl}piperidine-3-carboxylic acid

2-cyclobutyl-2-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methyloxolan-3-yl]formamido}acetic acid

2-cyclobutyl-2-[7-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)heptanamido]acetic acid

2-cyclobutyl-2-[3-ethoxy-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]acetic acid

3-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-(1H-imidazol-4-yl)propanamido]-2-hydroxy-2-methylpropanoic acid

3-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-(1H-imidazol-4-yl)propanamido]-2-methoxypropanoic acid

2-Methyl-3-{[1-(3-methyl-1,2,4-thiadiazol-5-yl)piperidin-4-yl]methoxy}pyrazine

(2S)-4-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-(1H-imidazol-4-yl)propanamido]-2-hydroxybutanoic acid

2-{1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylcyclohexanecarbonyl]azetidin-3-yl}acetic acid

2-Methyl-3-{[1-(pyrimidin-2-yl)piperidin-4-yl]methoxy}pyrazine

2-{1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylcyclohexyl]-N-(prop-2-en-1-yl)formamido}acetic acid