You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[4-(2,2-dimethylpropyl)-1,5-dimethylpyridin-1-ium-2-yl]-8-methylpyrido[1,2-a]benzimidazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H28N3+
assistant