You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1-(3-hydroxypiperidin-1-yl)-2-(3-hydroxy-4-sulfanylidene-2,3-dihydro-1H-pyrazolo[3,4-d]pyrimidin-5-yl)-2-phenylethanone by IUPAC nomenclature, provide its molecular formula.
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C18H21N5O3S
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