In the title compound, C14H12N4O2S, the triazole ring is nearly coplanar with the phenol unit, the dihedral angle being 6.60 (3)°. The crystal structure involves an inter­molecular N—H⋯O hydrogen bond and intra­molecular O—H⋯N and C—H⋯O hydrogen bonds.

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In the title compound, C13H11N5OS, molecules are linked into centrosymmetric dimers through intermolecular N—H...O hydrogen bonds.

The title compound, C17H17N5O3S, displays van der Waals and C—H...O interactions, and also C—H...π stacking which is effective in the crystal packing.