You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-[[4-ethyl-5-(furan-2-yl)-1,2,4-triazol-3-yl]sulfanylmethyl]-3H-thieno[3,2-d]pyrimidin-4-one is given. What is its corresponding molecular formula?
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C15H13N5O2S2
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