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-methyl-1-[2-[(2R,3S)-2-methyl-3-(3-methyl-1,2,4-oxadiazol-5-yl)morpholin-4-yl]-2-oxoethyl]pyridin-2-one by IUPAC nomenclature, provide its molecular formula.
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C16H20N4O4
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