4-{1-[3-(3,4-dimethylphenoxy)-2-hydroxypropyl]-1H-benzimidazol-2-yl}-1-phenylpyrrolidin-2-one

3-{2-[(2S)-3-(benzyl carboxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]ethoxy}propanoic acid

2-{2-[(2S)-3-(benzyl carboxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]acetamido}acetic acid

2-[(2S)-3-(benzyl carboxy)-N-ethyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-2-methylpropanoic acid

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

3-[(2S)-3-(benzyl carboxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-3-cyclopropylbutanoic acid

rac-(3R,4R)-1-[3-ethoxy-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-oxopropanoyl]-4-methylpyrrolidine-3-carboxylic acid

2-[2-(ethyl carboxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-(2-methylpropyl)acetamido]acetic acid

(2S)-2-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolan-3-yl]formamido}-4-methoxy-4-oxobutanoic acid

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

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