You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(2,4-dimethoxyphenyl)-2-[4-(5-fluoro-2-methylbenzimidazol-1-yl)piperidin-1-ium-1-yl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C23H28FN4O3+
assistant