You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-cyano-N-[5-fluoro-3-[(1-formylpiperidin-4-ylidene)methyl]-2-methylphenyl]-1-methyl-6-oxopyridine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21FN4O3
assistant