You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 6-bromo-18-methyl-3,13,18-triazahexacyclo[14.7.0.02,10.04,9.011,15.017,21]tricosa-1(16),2(10),4(9),5,7,11(15),17(21),19,22-nonaene-12,14-dione is given. What is its corresponding molecular formula?
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C21H12BrN3O2
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