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In the title compound, C17H20BrNO3, synthesized from spiro­[2H-1,3-benzoxazine-2,1′-cyclo­hexan]-4(3H)-one and 2-bromo­butanoyl bromide, the chair cyclohexane ring in the mol­ecule shows high asymmetric induction in the synthesis of trans β-lactams.

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In the title compound, C20H21NO3, the dihedral angle between the two benzene rings is 8.79 (7)° and the cyclo­hexane ring adopts a chair conformation. The mol­ecules are linked by paired N—H...O hydrogen bonds into centrosymmetric R22(8) dimers.
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