You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 3-(9,9-dimethylfluoren-3-yl)-9-(3,5-diphenylphenyl)-5-(4,6-diphenylpyrimidin-2-yl)carbazole ?
user
C61H43N3
assistant