You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2,6-dichloro-4-nitrophenyl)-[4-(2,6-dichloro-4-nitrophenyl)iminopentan-2-ylidene]-methylazanium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H15Cl4N4O4+
assistant