(S)-2-Amino-N-[(R)-2-(tert-butyl-dimethyl-silanyloxy)-1-(3-hydroxy-phenyl)-ethyl]-propionamide

{(R)-1-[(R)-1-{(S)-1-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-(3-hydroxy-phenyl)-ethylcarbamoyl]-ethylcarbamoyl}-2-(4-fluoro-3-nitro-phenyl)-ethylcarbamoyl]-3-methyl-butyl}-methyl-carbamic acid tert-butyl ester