(R)-N-trichloroethoxycarbonyl-4-fluoro-3-nitrophenylalanine

{(R)-2-Benzyloxy-1-[3-(3-{(S)-1-[(R)-3-(4-fluoro-3-nitro-phenyl)-2-(2,2,2-trichloro-ethoxycarbonylamino)-propionylamino]-2-hydroxy-ethyl}-5-methoxy-phenoxy)-4-methoxy-phenyl]-ethyl}-carbamic acid tert-butyl ester