You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-(oxolan-3-ylmethoxy)-5-propylsulfonylpyridin-3-yl]-3-[3-(trifluoromethyl)phenyl]urea into its molecular formula.
user
C21H24F3N3O5S
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