Ethyl 2-[2-(4-hy­droxy-3-meth­oxy­benzyl­idene)hydrazin-1-yl­idene]-3,4-dimethyl-2,3-dihydro-1,3-thia­zole-5-carboxyl­ate

The title compound, C16H19N3O4S, is almost planar, with a dihedral angle of 2.88 (9)° between the mean planes of the benzene and thia­zole rings. The mol­ecule adopts an E conformation about the two C=N bonds, with a C—N—N—C torsion angle of −177.01 (11)°. An intra­molecular C—H⋯O hydrogen bond exists between a thia­zole methyl group and the formic acid ethyl ester carbonyl O atom. In the crystal, mol­ecules are linked by O—-H⋯O hydrogen bonds, forming chains propagating along [2-10]. The chains are linked via C—H⋯O hydrogen bonds with R22(12) ring motifs, forming sheets lying parallel to (12-2). The sheets are further linked through out-of-plane C—H⋯N hydrogen bonds with R22(12) ring motifs and C—H⋯π inter­actions, forming an inter­esting three-dimensional supra­molecular architecture.