You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[3-(difluoromethoxy)phenyl]methyl]-2-[[(E)-3-(4-methoxyphenyl)prop-2-enoyl]amino]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22F2N2O4
assistant