You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(9,9-dimethylfluoren-2-yl)-N-(2,4-diphenylphenyl)tetraphenylen-2-amine;N-(9,9-dimethylfluoren-2-yl)-N-[4-(4-phenylphenyl)phenyl]tetraphenylen-2-amine;N-(9,9-dimethylfluoren-2-yl)-N-(2-phenylphenyl)tetraphenylen-2-amine;N-(9,9-dimethylfluoren-2-yl)-N-(4-phenylphenyl)tetraphenylen-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C216H156N4
assistant