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 ethyl 2-[(3Z)-3-(2-ethoxy-2-oxoethylidene)-2,4-dihydroquinoxalin-1-yl]acetate is given. What is its corresponding molecular formula?
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C16H20N2O4
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