You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-[[1-(difluoromethyl)benzimidazol-2-yl]methyl]piperazin-1-yl]-(2,5-dimethylfuran-3-yl)methanone by IUPAC nomenclature, provide its molecular formula.
user
C20H22F2N4O2
assistant