Acta Cryst. (2012). C68, o431-o435
[ doi:10.1107/S0108270112039534 ]

The inner-salt zwitterion, the dihydrochloride dihydrate and the dimethyl sulfoxide disolvate of 3,6-bis(pyridin-2-yl)pyrazine-2,5-dicarboxylic acid

Y. Wang and H. Stoeckli-Evans

Formula: C₁₆H₁₀N₄O₄ and ·2C₂H₆OS, and C₁₆H₁₂N₄O₄²⁺·2Cl^-·2H₂O

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