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The crystal structure of the title compound, disodium 1,2,3,4-tetraoxo-5-cyclohexene-5,6-diolate, 2Na+·C6O62−, is built up of alternating layers of hexagonally packed Na+ cations and rhodizonate dianions. The rhodizonate dianion has a slightly twisted conformation.
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Dinnebier et al. (2005) studied this question.
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