You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-[2-[[5-[(dimethylamino)methyl]furan-2-yl]methylsulfanyl]ethylimino]-5-[(6-methylpyridin-3-yl)methyl]-5H-pyrimidin-4-one;trihydrochloride by IUPAC nomenclature, provide its molecular formula.
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C21H30Cl3N5O2S
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