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We have encountered two polymorphs of the title compound, C 24 H 16 B 2 OS 2 , both of which display almost the same unit-cell parameters. Compound (I) crystallizes in the non-centrosymmetric space group P 2 1 with four mol-ecules in the asymmetric unit. These mol-ecules are related by pseudosymmetry. As a result, the space group looks like P 2 1 / c , but the structure cannot be refined successfully in that space group. Compound (II) on the other hand crystallizes in the centrosymmetric space group P 2 1 / c with only two mol-ecules in the asymmetric unit. The crystals studied for (I) and (II) were both non-merohedral twins.

Polymorphism and pseudosymmetry of 10,10′-oxybis(9-thia-10-hydro-10-boraanthracene)