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Translate the chemical IUPAC name 1-(5-ethyl-2,3,4,4a,6,7,8,8a-octahydro-1,5-naphthyridin-1-yl)-3-(3-pyrimidin-2-yl-1,2,4-oxadiazol-5-yl)propan-1-one into its molecular formula.
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C19H26N6O2
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