2-[2-(2,6-dioxopiperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl]acetic acid

2-(1-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolan-3-yl}-N-(propan-2-yl)formamido)acetic acid

2-(1-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolan-3-yl}-N-propylformamido)acetic acid

2-(1-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolan-3-yl}-N-methylformamido)-2-methylpropanoic acid

4-({5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolan-3-yl}formamido)pentanoic acid

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

4-({5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolan-3-yl}formamido)-2-methylbutanoic acid

rac-(3R,5R)-5-[({1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}formamido)methyl]oxolane-3-carboxylic acid

3-({3-[benzyl(methyl)amino]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido}methyl)cyclohexane-1-carboxylic acid

3-{[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]methyl}cyclohexane-1-carboxylic acid

2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-(2-hydroxyethyl)-5-methylhex-4-enamido]acetic acid