[(S)-2-((S)-2-Amino-3-carbamoyl-propionylamino)-4-methyl-pentanoylamino]-acetic acid methyl ester; compound with trifluoro-acetic acid

((S)-2-{(S)-2-[(S)-2-Amino-3-(1H-imidazol-4-yl)-propionylamino]-3-carbamoyl-propionylamino}-4-methyl-pentanoylamino)-acetic acid methyl ester; compound with trifluoro-acetic acid