You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(difluoromethoxy)-N-[[(2R)-5-ethoxy-2-methyl-2,3-dihydro-1-benzofuran-6-yl]methyl]-3-methoxybenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23F2NO5
assistant