1-(2-(3,5-dimethyl-4-(thiophen-3-yl)-1H-pyrazol-1-yl)ethyl)-3-(4-fluorobenzyl)urea

(2R)-1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopent-1-ene-1-carbonyl]-4,4-difluoropyrrolidine-2-carboxylic acid

(2R)-1-[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-4,4-difluoropyrrolidine-2-carboxylic acid

(2R)-1-{1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropanecarbonyl}-4,4-difluoropyrrolidine-2-carboxylic acid

(2R)-1-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanoyl]-4,4-difluoropyrrolidine-2-carboxylic acid

4-({1-[(tert-butoxy)carbonyl]-2,2-dimethyl-1,2,3,4-tetrahydroquinolin-4-yl}({[(9H-fluoren-9-yl)methoxy]carbonyl})amino)butanoic acid

4-({7-[(tert-butoxy)carbonyl]-7-azaspiro[3.5]nonan-2-yl}({[(9H-fluoren-9-yl)methoxy]carbonyl})amino)butanoic acid

4-({1'-[(tert-butoxy)carbonyl]-3,4-dihydrospiro[1-benzopyran-2,4'-piperidin]-4-yl}({[(9H-fluoren-9-yl)methoxy]carbonyl})amino)butanoic acid

(2E)-3-(1-{[(9H-fluoren-9-yl)methoxy]carbonyl}piperidin-3-yl)prop-2-enoic acid

4-[({1-[(tert-butoxy)carbonyl]azetidin-3-yl}methyl)({[(9H-fluoren-9-yl)methoxy]carbonyl})amino]butanoic acid

4-({[(4R)-3-[(tert-butoxy)carbonyl]-2,2-dimethyl-1,3-oxazolidin-4-yl]methyl}({[(9H-fluoren-9-yl)methoxy]carbonyl})amino)butanoic acid