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Acta Cryst. (2013). E69, o472
[ doi:10.1107/S1600536813005631 ]

2-(4-Aminobenzenesulfonamido)-4,6-dimethylpyrimidin-1-ium 2-carboxy-4,6-dinitrophenolate

G. Smith and U. D. Wermuth

Abstract: In the structure of the phenolate salt of the sulfa drug sulfamethazine with 3,5-dinitrosalicylic acid, C12H15N4O2S+·C7H3N2O7-, the dihedral angle between the pyrimidine and benzene rings of the cation is 59.70 (17)°. In the crystal, cation-anion hydrogen-bonding interactions involving pyrimidine-carboxy N+-H...O and amine-carboxy N-H...O pairs give a cyclic R22(8) motif while secondary N-H...O hydrogen bonds between the aniline group and both sulfone and nitro O-atom acceptors give a two-dimensional structure extending in (001).

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