N-(2-Allyl-4-chloro-2H-indazol-5-yl)-4-meth­oxy­benzene­sulfonamide hemi­hydrate

The fused five- and six-membered rings in the title compound, C₁₇H₁₆ClN₃O₃S·0.5H₂O, are practically coplanar, with the maximum deviation from the mean plane being 0.057 (3) Å for the C atom bound to the exocyclic N atom. The indazole system makes a dihedral angle of 66.18 (12)° with the plane through the benzene ring, and it is nearly perpendicular to the allyl group, as indicated by the N—N—C—C torsion angle of 79.2 (3)°. In the crystal, the water mol­ecule, lying on a twofold axis, forms O—H...N and accepts N—H...O hydrogen bonds. Additional C—H...O hydrogen bonds contribute to the formation of a chain along the b-axis direction.