You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 9-[2-[2-[3,6-bis(3,5-dimethylphenyl)carbazol-9-yl]-6-isocyanophenyl]-4-methylphenyl]-3,6-bis(3,5-dimethylphenyl)carbazole ?
user
C70H57N3
assistant