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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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