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Name the molecular formula for the molecule established as 8-(4-bromophenyl)-6-methyl-4-phenyl-2,4,5,11,13-pentazatricyclo[7.4.0.03,7]trideca-1(9),2,5,7-tetraene-10,12-dione using the IUPAC nomenclature.
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C21H14BrN5O2
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