N-(2-Chloro­phen­yl)-4-hydr­oxy-2H-1,2-benzothia­zine-3-carboxamide 1,1-dioxide

In the title compound, C(15)H(11)ClN(2)O(4)S, there are two independent mol­ecules in the asymmetric unit, in which the heterocyclic thia­zine rings in both mol­ecules adopt half-chair conformations. The conformations about the C—C and C—N bonds in the central C—C—N—C chain in both mol­ecules are all EZ. There are strong intra­molecular O—H⋯O and N—H⋯N hydrogen bonds resulting in graph-set patterns S(6) and S(5) for the oxo and amino rings, in addition to intra­molecular N—H⋯Cl inter­actions. In the crystal structure, mol­ecules are linked by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds into chains along [100].