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-[2-[5-(3,4-dichloro-N-methylanilino)-7-oxo-6H-pyrazolo[4,3-d]pyrimidin-1-yl]ethyl]-3,5-dimethyl-1,2-oxazole-4-carboxamide into its molecular formula.
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C20H19Cl2N7O3
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