{(S)-3-[(R)-2-(Benzyloxycarbamoyl-methyl)-heptanoylamino]-2-oxo-azepan-1-yl}-acetic acid methyl ester

{(S)-3-[(R)-2-((S)-1-Benzyloxycarbamoyl-ethyl)-4-methyl-pentanoylamino]-2-oxo-azepan-1-yl}-acetic acid methyl ester