Received 23 November 2012
The asymmetric unit of the title compound, C6H9N3, contains three crystallographically independent molecules of similar geometry. All of the molecules are almost planar, with r.m.s. deviations of 0.003, 0.016 and 0.005 Å. In the crystal, the molecules are linked by N-HN hydrogen bonds into zigzag ribbons parallel to the c axis, generating rings of R22(8) graph-set motif.
For background to sulfonylurea herbicides, see: Deng (2003). For the properties and crystal structures of metal complexes of the title compound, see: Sun et al. (2010); Yang (2009). For the structure of a hydrate form of the title compound, see: Lin et al. (2008). For the synthesis, see: Fan et al. (2000); Yao & Qu (1997).
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2008); software used to prepare material for publication: SHELXTL and publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: RZ5030 ).
Financial support by the Doctoral Startup Foundation of Hengyang Normal University (09B02) and the Foundation of Hengyang Bureau of Science and Technology (2011 K J21) are gratefully acknowledged.
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