2-{(E)-[(2Z)-(3-Chloro-1-methyl-2,2-di­oxo-3,4-dihydro-1H-2,1-benzo­thia­zin-4-yl­idene)hydrazinyl­idene]meth­yl}phenol

In the title compound, C(16)H(14)ClN(3)O(3)S, the thia­zine ring adopts a sofa (half-chair) conformation, with an r.m.s. deviation from the mean plane of 0.23 Å. The S atom and S-bonded C atom exhibit the maximum deviations from the thia­zine mean plane [−0.3976 (12) and 0.3179 (14) Å, respectively]. The conformations around the double bonds in the R (2)C=N—N=CHR unit are Z and E. An intra­molecular O—H⋯N hydrogen bond with the hy­droxy group as donor generates an S(6) ring motif. In the crystal, pairs of weak C—H⋯O inter­actions connect the mol­ecules, forming inversion dimers.