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• Structure

  4-Bromo-2-hydroxybenzoic acid is almost planar (r.m.s. deviation for the non-H atoms = 0.035 Å) and an intra­molecular O—H⋯O hydrogen bond closes an S(6) ring. The plane defined by the non-H atoms of the carboxyl group is twisted slightly by 4.8 (4)° to the mean plane of the phenyl ring. In the crystal, inversion dimers linked by pairs of O—H⋯O hydrogen bonds generate (8) loops. Short Br⋯Br contacts [3.4442 (5) Å] between the mol­ecules of the adjacent (8) dimers leads to a one-dimensional architecture.
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