You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-(3-benzyl-1,2,3,4-tetrahydro-1,3,5-triazine-3,5-diium-6-yl)-4,8-dimethylquinazolin-2-amine by IUPAC nomenclature, provide its molecular formula.
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C20H24N6+2
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