You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named N-[[5-(2-chloro-4-nitrophenyl)furan-2-yl]methylideneamino]-2-(3,4-dimethoxyphenyl)acetamide is given. What is its corresponding molecular formula?
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C21H18ClN3O6
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