You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[1-(5-ethyl-3-methylpyridin-2-yl)piperidin-4-yl]-3-(2-fluoro-4-methylsulfanylanilino)pyrrolidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H31FN4OS
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