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system
Name the molecular formula for the molecule established as [(4aR,8aR)-4-(2-methoxyethyl)-3,4a,5,7,8,8a-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-6-yl]-(oxan-4-yl)methanone using the IUPAC nomenclature.
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C16H28N2O4
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