Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 1 (January 2012)

organic compounds

Acta Cryst. (2012). E68, o132    [ doi:10.1107/S1600536811052366 ]

5,6-Dimethyl­pyrazine-2,3-dicarb­oxy­lic acid

F.-H. Liu

Abstract: 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-H...N hydrogen bonds, which link the mol­ecules into layers along [101].

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