You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2'-[3-[4-(4-naphthalen-1-ylphenyl)quinazolin-2-yl]phenyl]-10-phenylspiro[acridine-9,9'-fluorene] by IUPAC nomenclature, provide its molecular formula.
user
C61H39N3
assistant