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 1-[2-(2,4-dichlorophenyl)-2-[(2,4-dichlorophenyl)methoxy]ethyl]-3-[(5-fluoro-2,3-dihydro-1-benzofuran-2-yl)methyl]imidazol-1-ium .
user
C27H22Cl4FN2O2+
assistant