You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[1-(2-chloro-4-methylsulfonylbenzoyl)piperidin-4-yl]-4,4-dimethyl-1,3-oxazolidin-2-one by IUPAC nomenclature, provide its molecular formula.
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C18H23ClN2O5S
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