(S)-3-{2'-Benzyloxy-5'-((S)-2-benzyloxycarbonyl-2-benzyloxycarbonylamino-ethyl)-5-[4-((S)-2-benzyloxycarbonyl-2-benzyloxycarbonylamino-ethyl)-phenoxy]-6-hydroxy-biphenyl-3-yl}-2-benzyloxycarbonylamino-propionic acid benzyl ester