You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[6-isocyano-1,3-dimethyl-7-(2-methylpropyl)dibenzofuran-4-yl]-1-methylpyridin-1-ium into its molecular formula.
user
C25H25N2O+
assistant