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(S)-2-[(2S,3S)-2-((3S,4S)-4-{2-[9-(Benzylamino-methyl)-6,10-dioxo-1,4,7,8,9,10-hexahydro-6H-pyridazino[1,2-a][1,2]diazepin-1-yl]-acetylamino}-3-hydroxy-5-phenyl-pentanoylamino)-3-methyl-pentanoylamino]-3-phenyl-propionic acid methyl ester