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 [4-methyl-5-(3,4,5-trifluorophenyl)-3,4,12-triazatricyclo[6.3.1.02,6]dodeca-2,5-dien-12-yl]-pyridazin-4-ylmethanone is given. What is its corresponding molecular formula?
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C21H18F3N5O
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