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 5,6,7-tribromo-21-chloro-20,20-dimethyl-2,12,16,18-tetrazahexacyclo[10.10.0.01,9.02,19.03,8.015,19]docosa-3,5,7,13,15-pentaene-11,17-dione is given. What is its corresponding molecular formula?
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C20H16Br3ClN4O2
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