3,3-Dimethyl-1-{[(prop-2-en-1-yloxy)carbonyl]amino}cyclohexane-1-carboxylic acid

5-[N-ethyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluorobutanamido]pentanoic acid

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

3-ethyl-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluorobutanoyl]azetidine-3-carboxylic acid

3-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanamido]-4,4-difluorobutanoic acid

4-[3-cyclobutyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]hexanoic acid

(3S)-3-[3-cyclobutyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]pentanoic acid

(2S,4S)-1-[3-cyclobutyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-4-hydroxypyrrolidine-2-carboxylic acid

4-[3-cyclobutyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]but-2-ynoic acid

3-{1-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanoyl]pyrrolidin-2-yl}propanoic acid

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