You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-[3-[2,6-bis(trideuteriomethyl)phenyl]-1-methylpyridin-1-ium-2-yl]-2,7-dimethyl-[1]benzofuro[2,3-b]pyridine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H25N2O+
assistant