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The title compound, C 20 H 20 Br 2 N 2 O 2 , a tetra­dentate Schiff base, is the enanti­omerically pure  R , R -diastereomer of four possible stereoisomers. The mol­ecular structure reveals two strong intra­molecular O—H⋯N hydrogen bonds between the hy­droxy O atom and the imino N atom, which each generate  S (6) rings. In the crystal, mol­ecules are stacked in columns along the  a  axis; when viewed down the  b  axis, successive columns are stacked in the opposite direction. The structure reported herein is the monoclinic polymorph of the previously reported ortho­rhom­bic form [Yi & Hu (2009  ▶ ).  Acta Cryst . E 65 , o2643], in which the complete mol­ecule is generated by a crystallographic twofold axis.

A monoclinic polymorph of (R,R)-4,4′-dibromo-2,2′-[cyclohexane-1,2-diylbis(nitrilomethanylylidene)]diphenol