(2S)-1-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]furan-2-carbonyl}pyrrolidine-2-carboxylic acid

2-[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]-5-hydroxybenzoic acid

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

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

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

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

2-{1-[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]ethyl}-1,3-thiazole-4-carboxylic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5-(2-methyl-1,1-dioxo-1lambda6-thiomorpholin-4-yl)-5-oxopentanoic acid

6-{3-[benzyl(methyl)amino]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl}-6-azaspiro[2.5]octane-1-carboxylic acid

8-{3-[benzyl(methyl)amino]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl}-8-azabicyclo[3.2.1]octane-3-carboxylic acid

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