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Name the molecular formula for the molecule established as 7-(3,4-dichlorophenyl)-2-(3-hydroxypropyl)-5-methyl-N-pyridin-3-yl-4,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide using the IUPAC nomenclature.
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C21H20Cl2N6O2
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