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 N-[N-(3,4-dimethylphenyl)-N'-(pyridin-4-ylmethyl)carbamimidoyl]-4-fluorobenzamide is given. What is its corresponding molecular formula?
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C22H21FN4O
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