Tert-butyl 5-oxa-2-azaspiro[3.4]octane-2-carboxylate

2-{3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbutanamido]cyclopentyl}acetic acid

rac-(1R,3S)-3-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetamido}cyclopentane-1-carboxylic acid

(2S,4S)-1-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanoyl]-4-hydroxypyrrolidine-2-carboxylic acid

(2S)-4-{[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]formamido}-2-hydroxybutanoic acid

2-{1-[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]-N-(prop-2-yn-1-yl)formamido}acetic acid

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

(2S,3R)-2-({1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopentyl}formamido)-3-hydroxybutanoic acid

(2R)-1-[(2S)-3-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]piperidine-2-carboxylic acid

2-{1-[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]-N-propylformamido}acetic acid

3-{[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]formamido}-2-methylbutanoic acid