Acta Cryst. (2008). E64, o914 [ doi:10.1107/S160053680801115X ]
Abstract: The low-temperature structure of the title compound, C4H8N2O, is ordered, whereas the central methylene groups is disordered in the reported room-temperature structure. The molecule lies across a mirror plane; adjacent molecules are linked by an N-HO hydrogen bond into a chain.
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