You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[2-chloro-5-(trifluoromethyl)phenyl]-4-[3-(3,4-dimethoxyphenyl)-6-oxopyridazin-1-yl]butanamide into its molecular formula.
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C23H21ClF3N3O4
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