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-fluoro-3,5-dimethylphenyl)sulfonyl-2-pyridin-3-ylpiperazine;hydrochloride is given. What is its corresponding molecular formula?
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C17H21ClFN3O2S
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