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Name the molecular formula for the molecule established as 8-(2-methyl-7-oxo-1H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carbonyl)-1-(2-methylpropyl)-1,3,8-triazaspiro[4.5]decane-2,4-dione using the IUPAC nomenclature.
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C18H23N7O4
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