N-[(1S,3S,4S)-1-Benzyl-3-hydroxy-5-phenyl-4-aminopentyl]carbamic Acid tert-Butyl EsterN-[(1S,3S,4S)-4-Amino-3-hydroxy-5-phenyl-1-(phenylmethyl)pentyl]carbamic Acid 1,1-Dimethylethyl Ester(2S,3S,5S)-2-Amino-3-hydroxy-5-(tert-butyloxycarbonylamino)-1,6-diphenylhexane