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Name the molecular formula for the molecule established as 2-(3-chloro-4-fluorophenyl)-5-(3,3-dimethylbutanoyl)spiro[4,7-dihydropyrazolo[1,5-a]pyrazine-6,1'-cyclopropane]-3-carboxamide using the IUPAC nomenclature.
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C21H24ClFN4O2
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