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 4-(2-methylpiperidin-4-yl)oxy-1-(4-methylsulfonylphenyl)pyridin-2-one;hydrochloride is given. What is its corresponding molecular formula?
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C18H23ClN2O4S
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