4-[4-(6-ethyl-2-piperidin-1-ylpyrimidin-4-yl)piperazin-1-yl]-1H-pyridazin-6-one

5-{3-[benzyl(methyl)amino]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido}-1-methyl-1H-pyrazole-4-carboxylic acid

Chloromethyl 3-hydroxy-3-methylpiperidine-1-carboxylate

5-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-1-methyl-1H-pyrazole-3-carboxylic acid

7-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanoyl]-7-azabicyclo[2.2.1]heptane-1-carboxylic acid

(1RS,6SR)-3-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-3-azabicyclo[4.1.0]heptane-7-carboxylic acid

2-{[(Benzyloxy)carbonyl](2-chloropyridin-3-yl)amino}butanoic acid

3-[(Benzyloxy)carbonyl]-2-[2-(methylsulfanyl)ethyl]-1,3-thiazolidine-4-carboxylic acid

rac-(1R,6S)-3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbutanoyl]-3-azabicyclo[4.1.0]heptane-7-carboxylic acid

(2S)-2-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1-methyl-1H-pyrazol-5-yl]formamido}-3-methylpentanoic acid

3-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1-methyl-1H-pyrazole-3-carbonyl]-2-methyl-1,3-thiazolidine-4-carboxylic acid