You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,4-difluoro-N-[2-[methyl-[(2-piperidin-1-ylphenyl)methyl]amino]-2-oxoethyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H25F2N3O2
assistant