You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,7-bis(2,4-dimethylphenyl)-9-[2-[2-(2,4-dimethylphenyl)-7-(2-methylphenyl)carbazol-9-yl]-5-isocyano-4-pyridin-4-ylphenyl]carbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C67H52N4
assistant