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Name the molecular formula for the molecule established as methyl 1'-(furan-3-ylmethyl)-3-pyridin-3-ylspiro[6,8-dihydro-[1,2,4]triazolo[4,3-a]pyrazine-5,4'-piperidine]-7-carboxylate using the IUPAC nomenclature.
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C21H24N6O3
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