You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(2,5-difluorophenyl)-2-[4-methyl-3-(1-methylsulfonylpiperidin-3-yl)-5-oxo-1,2,4-triazol-1-yl]acetamide into its molecular formula.
user
C17H21F2N5O4S
assistant