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Name the molecular formula for the molecule established as 2-[(2S)-1-acetylpiperidin-2-yl]-1-[(2R)-2-(5-propan-2-yl-1,2,4-oxadiazol-3-yl)pyrrolidin-1-yl]ethanone using the IUPAC nomenclature.
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C18H28N4O3
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