You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4,4-bis(4-chlorophenyl)-6-methoxy-9-(4-methoxyphenyl)-2-oxocyclopenta[b]naphthalene-1,1,3-tricarbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C36H21Cl2N3O3
assistant