[((S)-2-tert-Butoxycarbonylamino-octanoyl)-methyl-amino]-acetic acid methyl ester

(S)-2-{[(S)-2-((R)-2-{2-[((S)-2-{(S)-2-[((S)-2-tert-Butoxycarbonylamino-4-methyl-pentanoyl)-methyl-amino]-3-phenyl-propionylamino}-octanoyl)-methyl-amino]-acetoxy}-propionylamino)-octanoyl]-methyl-amino}-4-methyl-pentanoic acid tert-butyl ester