You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (7R)-7-tert-butyl-3-(4-methoxyphenyl)-2-sulfanylidene-5,6,7,8-tetrahydro-1H-[1]benzothiolo[2,3-d]pyrimidin-4-one by IUPAC nomenclature, provide its molecular formula.
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C21H24N2O2S2
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