benzyl ((1S,2R)-2-(((S)-1-chloro-2-oxo-5-phenylpentan-3-yl)carbamoyl)cyclopentyl)carbamate

benzyl ((S)-1-(((S)-1-chloro-2-oxo-5-phenylpentan-3-yl)amino)-1-oxo-4-phenylbutan-2-yl)carbamate

benzyl ((1S,6R)-6-(((S)-1-hydroxy-2-oxo-5-phenylpentan-3-yl)carbamoyl)cyclohex-3-en-1-yl)carbamate