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 1-[4-(2-methylsulfonylethyl)piperazin-1-yl]-4-pyrrolidin-1-ylbutane-1,4-dione is given. What is its corresponding molecular formula?
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C15H27N3O4S
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