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For the molecule named tert-butyl (1S,4R,6S)-4-[2-[5-(trifluoromethyl)pyrazin-2-yl]ethyl]-3-azabicyclo[4.1.0]heptane-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C18H24F3N3O2
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