You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(4-chlorophenyl)methyl]-N-[(Z)-(3-chloro-4-propoxyphenyl)methylideneamino]-2-oxopyridine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H21Cl2N3O3
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