You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-(2,4-difluorophenoxy)-3-[1-methyl-5-(methylamino)-6-oxopyridin-3-yl]phenyl]-N-ethylprop-2-ynamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H21F2N3O3
assistant