(3R,4S,5S)-5-benzyl-4-hydroxy-3-<1(S)-(1,1-dimethylethoxycarbonylamino)-2-phenyl-ethyl>pyrrolidin-2-one

(2S,3S)-2-(N-benzylamino)-3-(N,N-dibenzylamino)-4-phenylbutanenitrile

(2S,4R)-1-((2R,3S)-3-Amino-2-hydroxy-4-phenyl-butyl)-4-(pyridin-4-ylmethoxy)-piperidine-2-carboxylic acid tert-butylamide

(2R,4R,5S)-2-Benzyl-5-(tert-butoxycarbonyl)amino-4-hydroxy-6-phenylhexanoic acid

(2S,3R,6R)-2,6-Diamino-1,7-diphenyl-heptan-3-ol