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

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