You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name N-(4-chlorophenyl)-2-(3,5-dichloroanilino)-4,7-dioxo-1,2,3,4a,5,6,8,8a-octahydropyrido[2,3-d]pyrimidine-5-carboxamide into its molecular formula.
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C20H18Cl3N5O3
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