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(S)-3-{(S)-2-[(S)-2-{[(3S,6S,9S,17R)-9-tert-Butoxycarbonylamino-3-butyl-6-(4-hydroxy-benzyl)-2,5,8,11-tetraoxo-1,4,7,12-tetraaza-cycloheptadecane-17-carbonyl]-amino}-3-(1H-indol-3-yl)-propionylamino]-hexanoylamino}-succinamic acid