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system
Name the molecular formula for the molecule established as 7-(4-methoxy-3-nitrophenyl)-5-methyl-N-(4-methylphenyl)-4,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxamide using the IUPAC nomenclature.
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C21H20N6O4
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