You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[1-[3-(1,1-difluoroethyl)-1,2,4-oxadiazol-5-yl]piperidin-4-yl]-3-(2,5-difluoro-4-methylsulfonylanilino)piperidin-2-one .
user
C21H25F4N5O4S
assistant