You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2'R,6'S)-2',6'-dimethyl-2-(trifluoromethyl)spiro[6,7-dihydrothieno[3,2-c]pyran-4,4'-piperidine] into its molecular formula.
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C14H18F3NOS
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