N-(1-([1,2,4]triazolo[4,3-b]pyridazin-6-yl)pyrrolidin-3-yl)-3-methyl-2-oxo-2,3-dihydrobenzo[d]oxazole-5-sulfonamide

3-cyclopropyl-4-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]butanoic acid

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

(2RS,3RS)-3-{[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]methyl}oxolane-2-carboxylic acid

2-{[5-cyano-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]methyl}-3-methylbutanoic acid

2-(2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)spiro[3.3]heptan-2-yl]formamido}ethoxy)acetic acid

(3RS,4RS)-1-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoyl]-4-methylpyrrolidine-3-carboxylic acid

3-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]-2-fluorobenzoic acid

(2R)-1-(2-{3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}acetyl)pyrrolidine-2-carboxylic acid

(1rs,3rs)-3-[(4S)-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5,5,5-trifluoropentanamido]cyclobutane-1-carboxylic acid

4-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutaneamido]benzoic acid