You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[3-(3-acetamido-4-methylphenyl)-6-oxopyridazin-1-yl]-N-(2,6-difluorophenyl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H20F2N4O3
assistant