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 2-(3-chloroanilino)-N-(2-methoxy-4-nitrophenyl)-4,7-dioxo-1,2,3,4a,5,6,8,8a-octahydropyrido[2,3-d]pyrimidine-5-carboxamide is given. What is its corresponding molecular formula?
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C21H21ClN6O6
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