[(1S,2R)-3-((2R,3S)-3-tert-Butoxycarbonylamino-2-hydroxy-4-phenyl-butylamino)-2-hydroxy-1-phenethyl-propyl]-carbamic acid benzyl ester

{(1S,2R)-3-[((2R,3S)-3-Amino-2-hydroxy-5-phenyl-pentyl)-(2-trimethylsilanyl-ethoxycarbonyl)-amino]-1-benzyl-2-hydroxy-propyl}-carbamic acid tert-butyl ester