You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-cyclohexa-1,5-dien-1-yl-7,9,9-trimethylfluorene;9,9-dimethyl-2-phenyl-7-propylfluorene;1-[4-(4-methylphenyl)phenyl]-9H-carbazole .
user
C71H65N
assistant