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 N-[4-(2',7'-dinaphthalen-2-ylspiro[acridine-9,9'-fluorene]-10-yl)phenyl]-4-phenyl-N-(4-phenylphenyl)aniline .
user
C75H50N2
assistant