N-((6-ethoxy-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methyl)furan-2-carboxamide

1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-4-propylpiperidine-4-carboxylic acid

1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexanecarbonyl]pyrrolidine-3-carboxylic acid

3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylpropanamido]-3-(thiophen-2-yl)propanoic acid

(2S)-2-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1H-1,2,4-triazol-3-yl]formamido}-3,3-dimethylbutanoic acid

(2S)-2-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1H-1,2,4-triazol-3-yl]formamido}-4-(methylsulfanyl)butanoic acid

3-{N-ethyl-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1,3-thiazol-4-yl]formamido}butanoic acid

3-[(2S,3S)-N-ethyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylpentanamido]butanoic acid

3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methoxypropanamido]-4-hydroxybenzoic acid

5-chloro-2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methoxypropanamido]benzoic acid

5-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methoxypropanamido]-2-methylbenzoic acid