5-[(Z)-2,3-Dimeth­oxy­benzyl­idene]-1,2,4-triazolo[3,2-b][1,3]thia­zol-6(5H)-one

The title compound, C₁₃H₁₁N₃O₃S, was synthesized from 1H-1,2,4-triazole-5-thiol in a one pot reaction. The fused thia­zolo[3,2-b][1,2,4]triazole system is essentially coplanar with the benzene ring: they enclose an inter­planar angle of 1.37 (13)°. The olefinic double bond is in a Z conformation. In the crystal, C—H...N hydrogen bonds link the mol­ecules into double layers parallel to the ab plane.