You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (3S)-3-[[(7R)-7-methyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-yl]sulfanyl]oxolan-2-one by IUPAC nomenclature, provide its molecular formula.
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C15H16N2O2S2
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