You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-(2,3-dihydro-1,4-benzoxazin-4-yl)-4-oxo-N-[3-(3-oxo-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridin-2-yl)propyl]butanamide by IUPAC nomenclature, provide its molecular formula.
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C21H27N5O4
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