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Translate the chemical IUPAC name 6-(2,4-dibromophenyl)-2-methyl-4,17-dioxa-6-azatetracyclo[8.7.0.03,8.011,15]heptadeca-1(10),2,8,11(15)-tetraen-16-one into its molecular formula.
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C21H17Br2NO3
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