You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(10-naphthalen-1-yl-8-spiro[fluorene-9,9'-xanthene]-4-ylanthracen-1-yl)spiro[fluorene-9,9'-xanthene] The above is the IUPAC name of a molecule. Write its molecular formula.
user
C74H44O2
assistant