Acta Cryst. (2013). C69, 1534-1536 [ doi:10.1107/S0108270113030746 ]
Abstract: The title compound, C3H6N2O, crystallizes with imposed twofold symmetry in the space group I41/a. The five-membered ring displays a half-chair conformation. N-HO hydrogen bonds connect the molecules to form R22(8) rings and thence ribbons parallel to the a and b axes. These intersect via O2H2 rings involving longer HO contacts. The crystal was merohedrally twinned. Preliminary indications of the higher symmetry space group I41/amd, which would require the ring to be planar, proved to be incorrect. A previous brief report of the structure in Fdd2 is also probably incorrect.
CCDC reference: 971130
Keywords: crystal structure; imidazolidin-2-one; twinning; pseudosymmetry; hydrogen bonding.
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