You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-(4-fluorophenyl)-5-methylthiophen-2-yl]-[5-(hydroxymethyl)-2-methylpiperidin-1-yl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C19H22FNO2S
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