You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-(2,4-dichlorophenyl)benzimidazol-1-yl]-N-[3-(trifluoromethyl)phenyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H14Cl2F3N3O
assistant