(2RS,3R)-3-[(tert-butoxycarbonyl)amino]-2-hydroxy-5-phenylpentanoic Acid

(R)-2-Amino-1-(5-chloro-benzooxazol-2-yl)-4-phenyl-butan-1-ol

2-[(2R)-4-Phenyl-2-amino-1-hydroxybutyl]-5,6-dimethylbenzoxazole

{(R)-4-[(R)-1-(Benzothiazol-2-yl-hydroxy-methyl)-3-phenyl-propylcarbamoyl]-4-tert-butoxycarbonylamino-butyl}-carbamic acid tert-butyl ester

{(R)-4-[(R)-1-(Benzooxazol-2-yl-hydroxy-methyl)-3-phenyl-propylcarbamoyl]-4-tert-butoxycarbonylamino-butyl}-carbamic acid tert-butyl ester