Acta Cryst. (2013). E69, o472 [ doi:10.1107/S1600536813005631 ]
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+-HO and amine-carboxy N-HO pairs give a cyclic R22(8) motif while secondary N-HO 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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