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In the title compound, C8H6Br4, intra­molecular C—H...Br hydrogen bonds generate two S(6) rings. The two geminal bromine-atom substituents point to opposite sides of the aromatic ring system. In the crystal, mol­ecules are linked by inter­molecular π–π inter­actions with centroid–centroid distances of 3.727 (9) and 3.858 (9) Å.

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In the crystal structure of the title compound, C8H6Br2O2, the carboxyl groups are involved in pairs of O—H...O hydrogen bonds, which link the mol­ecules into inversion dimers.

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In the title compound, C11H10O3, the 1-indanone unit is essentially planar (r.m.s. deviation = 0.036 Å). In the crystal, mol­ecules are linked by non-classical C—H...O hydrogen bonds, forming a C(6) chain along [010].
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