(3R,6S)-2,5-dimethoxy-6-isopropyl-3-(4-fluoro-3-nitrophenyl)-3,6-dihydro-1,4-pyrazine

(R)-tert-Butoxycarbonylamino-(3-{3-[(S)-1-[(R)-3-(4-fluoro-3-nitro-phenyl)-2-(2-trimethylsilanyl-ethoxycarbonylamino)-propionylamino]-2-(2-methoxy-ethoxymethoxy)-ethyl]-5-methoxy-phenoxy}-4-methoxy-phenyl)-acetic acid

(2R)-3-(4-fluoro-3-nitrophenyl)-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoic acid

(S)-{3-[5-((R)-2-Benzyloxy-1-tert-butoxycarbonylamino-ethyl)-2-methoxy-phenoxy]-5-methoxy-phenyl}-[(R)-3-(4-fluoro-3-nitro-phenyl)-2-(2-trimethylsilanyl-ethoxycarbonylamino)-propionylamino]-acetic acid

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

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

(R)-N-trimethylsilylethoxycarbonyl-4-fluoro-3-nitrophenylalanine methyl ester

[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

(R)-2-[(R)-2-(tert-Butoxycarbonyl-methyl-amino)-4-methyl-pentanoylamino]-3-(4-fluoro-3-nitro-phenyl)-propionic acid

[(R)-1-[(S)-1-{3-[5-((R)-1-tert-Butoxycarbonylamino-2-hydroxy-ethyl)-2-methoxy-phenoxy]-5-methoxy-phenyl}-2-(2-methoxy-ethoxymethoxy)-ethylcarbamoyl]-2-(4-fluoro-3-nitro-phenyl)-ethyl]-carbamic acid 2-trimethylsilanyl-ethyl ester