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-[9-(9H-fluoren-2-yl)carbazol-3-yl]-9-phenylcarbazole;3-[9-(9H-fluoren-2-yl)carbazol-3-yl]-9-phenylcarbazole;4-[9-(9H-fluoren-1-yl)carbazol-3-yl]-9-phenylcarbazole .
user
C129H84N6
assistant