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system
Name the molecular formula for the molecule established as 3-methyl-2-[2-(4-methylphenyl)-2-oxoethyl]sulfanyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one using the IUPAC nomenclature.
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C20H20N2O2S2
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