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 5-[4-(5-methylthiophen-2-yl)sulfonylpiperazin-1-yl]-1,3-dihydrobenzimidazol-2-one is given. What is its corresponding molecular formula?
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C16H18N4O3S2
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