Received 13 November 2011
The asymmetric unit of the title compound, C8H8N2O4, consists of one complete molecule and a second molecule generated by the application of twofold axis. The mean planes of the two carboxyl groups attached to the pyrazine ring at neighboring positions are twisted by 10.8 (1) and 87.9 (1)° in the complete molecule and 43.0 (1)° in the symmetry-generated molecule. The crystal packing features O-HN hydrogen bonds, which link the molecules into layers along .
For the synthesis of the title compound, see Tsuda & Fujishima (1981). For the structure of the hydrate of the title compound, see Vishweshwar et al. (2001, 2004). For a related compound containing pyrazine-2,3-dicarboxylic acid, see: Alborés & Rentschler (2009).
Data collection: PROCESS-AUTO (Rigaku, 1998); cell refinement: PROCESS-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: JJ2111 ).
The author thanks the Jilin Business and Technology College for financial support.
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