Acta Cryst. (2001). E57, o1250-o1251 [ doi:10.1107/S1600536801020128 ]
Abstract: Redetermination of the title compound, C15H16N4O2, at 193 K reveals considerable differences in geometry of the central bridging fragment as compared to that at 293 K [Atroshchenko, Blokhina, Shakhel'dyan, Grudtsyn, Gitis, Borbulevich, Blokhin, Kaminskii, Shishkin & Andrianov (2000). Russ. J. Org. Chem. 36, 684-692]. The results show that there is apparent shortening of the N=N bond and lengthening of both neighbouring C-N bonds in the room-temperature structure compared with the low-temperature structure.
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