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 methyl (Z)-4-[4-[[(Z)-4-methoxy-4-oxobut-2-enoyl]amino]-2,5-dimethylanilino]-4-oxobut-2-enoate is given. What is its corresponding molecular formula?
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C18H20N2O6
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