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Name the molecular formula for the molecule established as N-[(7S)-5-(3,4-dichlorophenyl)-7-methyl-4-oxo-6,7-dihydropyrazolo[1,5-a]pyrazin-3-yl]-5-methylpyridine-3-carboxamide using the IUPAC nomenclature.
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C20H17Cl2N5O2
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