7-[4-(3-methoxyphenyl)piperazine-1-carbonyl]-3-pentyl-4a,5,6,7,8,8a-hexahydro-1H-quinazoline-2,4-dione

1-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-octahydrocyclopenta[b]pyrrole-3a-carboxylic acid

8-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pent-4-enoyl]-8-azabicyclo[3.2.1]octane-3-carboxylic acid

2-cyclobutyl-3-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]propanoic acid

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

3-[3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]-4-hydroxybenzoic acid

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pent-4-ynoyl]-octahydrocyclopenta[b]pyrrole-3a-carboxylic acid

1-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutanecarbonyl]-octahydrocyclopenta[b]pyrrole-3a-carboxylic acid

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanoyl]-octahydrocyclopenta[b]pyrrole-3a-carboxylic acid

1-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoyl]-octahydrocyclopenta[b]pyrrole-3a-carboxylic acid

3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4,4-trifluorobutanamido]butanoic acid