You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[3-[(4aS,8aR)-6-methyl-3,4a,5,7,8,8a-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-4-yl]-3-oxopropyl]pyrimidin-4-one by IUPAC nomenclature, provide its molecular formula.
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C15H22N4O3
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