You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3'-(4-phenanthren-3-ylphenyl)-N-(2-phenylphenyl)-N-triphenylen-2-yl-9,9'-spirobi[fluorene]-2'-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C75H47N
assistant