4-Fluoro-5-hydroxynicotinaldehyde

(4R)-3-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-5-methyl-1,3-thiazole-4-carbonyl}-1,3-thiazolidine-4-carboxylic acid

5-[2-cyclobutyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]-3-methylpentanoic acid

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

2-cyclobutyl-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]acetic acid

2-cyclobutyl-2-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)furan-2-yl]formamido}acetic acid

5-[2-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]pyridine-3-carboxylic acid

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

4-[2-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]-3-hydroxybutanoic acid

5-[2-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]pyridine-2-carboxylic acid

5-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(propan-2-yl)butanamido]-2-methylpentanoic acid