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A dihydrate pseudopolymorph of bis­(2,4-dihy­droxy­phenyl)methanone, C13H10O5·2H2O, (I), was obtained during polymorphism screening of hy­droxy­benzophenone derivatives. This structure, in which the mol­ecule sits on a twofold axis, was compared with the known anhydrous form of (I) [Schlemper (1982). Acta Cryst. B38, 554-559]. The role of water in the crystal assembly was established on the basis of the known monohydrate pseudopolymorph of 3,4-dihy­droxy­benzo­phen­one [Landre, Souza, Corrêa, Martins & Doriguetto (2010). Acta Cryst. C66, o463-o465].
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