4-(1-(2-(m-Tolyl)acetyl)piperidin-4-yl)morpholine-3,5-dione

(2S)-2-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanamido]propanoic acid

5-{[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanamido]methyl}furan-2-carboxylic acid

4-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanoyl]-2-methylmorpholine-2-carboxylic acid

(1RS,5SR)-3-[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-3-azabicyclo[3.1.0]hexane-6-carboxylic acid

(1R,5S)-3-[3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-3-azabicyclo[3.1.0]hexane-6-carboxylic acid

2-(1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-5-methyl-1,3-thiazol-4-yl}-N-(prop-2-en-1-yl)formamido)acetic acid

(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