You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-[[(3S)-1-methylsulfonylpiperidin-3-yl]methyl]-2-(2-propan-2-ylpyrazol-3-yl)pyridine by IUPAC nomenclature, provide its molecular formula.
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C18H26N4O2S
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