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Name the molecular formula for the molecule established as (3aR,7aR)-4-[2-(dimethylamino)ethyl]-1-[(4-fluorophenyl)methyl]-2,3,3a,6,7,7a-hexahydropyrrolo[3,2-b]pyridin-5-one using the IUPAC nomenclature.
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C18H26FN3O
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