You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-[(Z)-[4-[(2,6-dichlorophenyl)methoxy]phenyl]methylideneamino]-N-(4-methoxyphenyl)oxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H19Cl2N3O4
assistant