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The title Schiff base compound, C9H11N3O2S, was prepared by the reaction of equimolar quantities of 2-hydroxy-4-methoxybenzaldehyde with thiosemicarbazide in methanol. The molecule adopts a trans configuration with respect to the azomethine group and an intramolecular O—H...N hydrogen bond generates an S(6) ring. In the crystal structure, molecules are linked through intermolecular N—H...O and N—H...S hydrogen bonds, forming a three-dimensional network.