You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-[4-(2-hydroxy-5-methylphenyl)sulfonylpiperazin-1-yl]-2-oxoethyl]-3-(trifluoromethyl)pyridin-2-one into its molecular formula.
user
C19H20F3N3O5S
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