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(8R,11R,14S,15R)-11-(4-Benzyloxy-phenyl)-5-bromo-8-tert-butoxycarbonylamino-18,19-dichloro-4,15-dihydroxy-9,12-dioxo-2-oxa-10,13-diaza-tricyclo[14.2.2.13,7]henicosa-1(19),3(21),4,6,16(20),17-hexaene-14-carboxylic acid methyl ester