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Name the molecular formula for the molecule established as 14-[(3-bromo-2-hydroxy-5-nitrophenyl)methylidene]-11-(3-nitrophenyl)-15-thia-12,17-diazatetracyclo[8.7.0.02,7.012,16]heptadeca-1(10),2,4,6,16-pentaen-13-one using the IUPAC nomenclature.
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C27H17BrN4O6S
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