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system
Name the molecular formula for the molecule established as 6-(5-bromo-2-methoxyphenyl)-4-methyl-N-(5-methyl-1,2-oxazol-3-yl)-2-oxo-3-prop-2-enyl-1,6-dihydropyrimidine-5-carboxamide using the IUPAC nomenclature.
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C20H21BrN4O4
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