Crystals of sulfathiazole, 4-amino-N-thiazol-2-ylidenebenzenesulfonamide, C 9 H 9 N 3 O 2 S 2 , formed from boiling water are shown to be a fifth polymorph. The crystal structure contains two independent molecules, which associate through hydrogen bonds and van der Waals interactions to produce a two-dimensional sheet structure.
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Hughes et al. (1999) studied this question.