You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 7,7-dimethyl-N-(4-methylphenyl)-5-(3-methyl-6-phenylcarbazol-9-yl)-N-naphthalen-1-ylbenzo[g]fluoren-9-amine by IUPAC nomenclature, provide its molecular formula.
user
C55H42N2
assistant