[1-({{3-[5-(2-benzyloxy-1-tert-butoxycarbonylamino-ethyl)-2-methoxy-phenoxy]-5-methoxy-phenyl}-[1-(3,5-dihydroxy-4-methoxy-phenyl)-2-hydroxy-ethylcarbamoyl]-methyl}-carbamoyl)-2-(4-fluoro-3-nitro-phenyl)-ethyl]-carbamic acid tert-butyl ester