You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-isocyano-9-[3-isocyano-5-[3-phenyl-5-(3-phenylphenyl)phenyl]phenyl]carbazole-3-carbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C45H26N4
assistant