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 3-[9-(9,9-dimethyl-5,6-dihydrofluoren-2-yl)-4b,7,8,8a-tetrahydrocarbazol-3-yl]-9-phenylcarbazole .
user
C45H38N2
assistant