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(9S,12S,15S)-12-(4-Benzyloxy-benzyl)-19,20-dibromo-9-tert-butoxycarbonylamino-5-chloro-4-hydroxy-10,13-dioxo-2-oxa-11,14-diaza-tricyclo[15.2.2.13,7]docosa-1(20),3,5,7(22),17(21),18-hexaene-15-carboxylic acid methyl ester