You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[1-[2-(diethylamino)ethyl]benzimidazol-2-yl]-4-(difluoromethoxy)-3-methoxybenzamide by IUPAC nomenclature, provide its molecular formula.
user
C22H26F2N4O3
assistant