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 4-N-(9,9-dimethyl-7,8-dihydrofluoren-2-yl)-1-N,1-N-diphenyl-4-N-(9-phenylcarbazol-3-yl)cyclohexa-1,3-diene-1,4-diamine .
user
C51H43N3
assistant