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 6-(4-benzylpiperidine-1-carbonyl)-5-methyl-3-[2-(2-methylpiperidin-1-yl)-2-oxoethyl]thieno[2,3-d]pyrimidin-4-one is given. What is its corresponding molecular formula?
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C28H34N4O3S
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