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(3R,6S,12S,15S)-15-[(Z)-2-((2S,3S)-2-Benzyloxycarbonylamino-3-methyl-pentanoylamino)-but-2-enoylamino]-12-((S)-sec-butyl)-6-isobutyl-9-methylene-5,8,11,14-tetraoxo-1-thia-4,7,10,13-tetraaza-cyclohexadecane-3-carboxylic acid methyl ester