You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[6-[1-(2,6-dimethylphenyl)-3-methylimidazol-3-ium-2-yl]-1-methylpyridin-1-ium-2-yl]-3-methylimidazo[1,2-a]benzimidazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H28N6+2
assistant