You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[(2-chlorophenyl)methyl]-N-[(Z)-(4-ethoxyphenyl)methylideneamino]-2-oxopyridine-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C22H20ClN3O3
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