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Name the molecular formula for the molecule established as tert-butyl (4aR)-8-bromo-9-cyclopropyloxy-7-fluoro-1,2,4,4a,5,11-hexahydropyrazino[2,1-c][1,4]benzoxazepine-3-carboxylate using the IUPAC nomenclature.
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C20H26BrFN2O4
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