You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4,5,6,7-tetrachloro-3,3-bis[2-[4-(dimethylamino)phenyl]-2-(4-ethylphenyl)ethenyl]-2-benzofuran-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C44H40Cl4N2O2
assistant