You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (E)-3-[4-(difluoromethoxy)-3-methoxyphenyl]-N-[[4-(2,2,2-trifluoroethoxymethyl)phenyl]methyl]prop-2-enamide .
user
C21H20F5NO4
assistant