You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[1-[4-(benzenesulfonyl)-4-methylpentyl]piperidin-3-yl]-4-methyl-1,3-oxazole;hydrochloride into molecular formula.
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C21H31ClN2O3S
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