5-[(2,2-dimethyl-2,3-dihydro-1H-indol-3-yl)amino]-2-(2,6-dioxopiperidin-3-yl)-2,3-dihydro-1H-isoindole-1,3-dione

2-{1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[2.2.1]heptan-2-yl]-N-(2-hydroxyethyl)formamido}acetic acid

4-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(methoxymethyl)butanamido]oxolane-3-carboxylic acid

2-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxan-4-yl]formamido}-3-methoxy-2-methylpropanoic acid

2-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopent-2-en-1-yl]formamido}-3-methoxy-2-methylpropanoic acid

2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]-3-methoxy-2-methylpropanoic acid

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

5-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(methoxymethyl)propanamido]methyl}furan-2-carboxylic acid

3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(methoxymethyl)butanamido]-2,2-difluoropropanoic acid

2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(methoxymethyl)propanamido]methyl}-4-methylpentanoic acid

4-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(methoxymethyl)propanamido]cyclohexane-1-carboxylic acid