You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(9,9-diphenylfluoren-2-yl)-9,9-dimethyl-N-(4-phenylphenyl)spiro[anthracene-10,9'-fluorene]-2'-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C65H47N
assistant