You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-[2,6-bis[2-(3,6-diphenylcarbazol-9-yl)phenyl]pyridin-4-yl]benzene-1,2-dicarbonitrile into its molecular formula.
user
C73H45N5
assistant