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Name the molecular formula for the molecule established as 2-[2-(3-methylpiperidin-1-yl)-2-oxoethyl]sulfanyl-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one using the IUPAC nomenclature.
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C18H23N3O2S2
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