You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2'Z,3'Z)-3'-(fluoromethylidene)-2'-[3-[4-(4-phenylphenyl)phenyl]butylidene]spiro[fluorene-9,1'-indene] The above is the IUPAC name of a molecule. Write its molecular formula.
user
C44H33F
assistant