(2-{(S)-1-[(E)-(1S,2R)-1-(2-Hydroxy-ethyl)-2-methyl-4-phenyl-but-3-enylcarbamoyl]-3-methyl-butylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester

(R)-2-{(2E,7E)-(5S,6R)-5-[(S)-2-(3-tert-Butoxycarbonylamino-propionylamino)-4-methyl-pentanoylamino]-6-methyl-8-phenyl-octa-2,7-dienoylamino}-3-(4-methoxy-phenyl)-propionic acid 2-trimethylsilanyl-ethyl ester