You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name [2-(3-hydroxyphenyl)spiro[4,5-dihydrothieno[2,3-c]pyran-7,4'-piperidine]-1'-yl]-(1,3-thiazol-4-yl)methanone into its molecular formula.
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C21H20N2O3S2
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