2-{[2-(1-Methyl-2,2-dioxo-3,4-dihydro-1H-2λ6,1-benzothiazin-4-ylidene)hydrazin-1-ylidene]methyl}phenol

Abstract

In the title compound, C16H15N3O3S, the dihedral angle between the aromatic rings is 8.18 (11)° and the C=N—N=C torsion angle is 178.59 (14)°. The conformation of the thiazine ring is an envelope, with the S atom displaced by 0.8157 (18) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.045 Å). An intramolecular O—H...N hydrogen bond closes an S(6) ring. In the crystal, weak C—H...O interactions link the molecules, with all three O atoms acting as acceptors.