Experimental Crystal data

disorder in main residue; R factor = 0.041; wR factor = 0.126; data-to-parameter ratio = 18.2. In the title compound, C19H20ClN3O3S, the benzene ring is inclined to the indazole ring system by 51.23 (8). In the crystal, molecules are linked by pairs of N—H O hydrogen bonds, forming inversion dimers which stack in columns parallel to [011]. The atoms in the allyl group are disordered over two sets of sites with an occupancy ratio of 0.624 (8):0.376 (8). Related literature For the biological activity of sulfonamides, see: El-Sayed et al