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What is the molecular formula of the compound with this IUPAC name 2-(2-methylpropyl)-1'-[(6-methylpyridin-2-yl)methyl]spiro[6,9-dihydro-[1,4]oxazino[3,4-c][1,2,4]triazine-7,3'-pyrrolidine]-3,4-dione ?
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C20H27N5O3
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