(R)-N-(2,2,2-trichloro-1,1-dimethylethoxycarbonyl)-4-fluoro-3-nitrophenyl-alanine

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