4-Amino-3-(4-hydroxyphenyl)-1H-1,2,4-triazol-5(4H)-one

Abstract

The molecule of the title compound, C8H8N4O2, is nearly planar, with a dihedral angle between the rings of 1.1 (1)°. Adjacent molecules are linked into a layered structure by hydroxy–oxo O—H...O and triazolyl–hydroxy N—H...O hydrogen bonds. Only one of the H atoms of the pyramidal amino group is engaged in building up the infinite layer. The second H atom of the amino group also shows hydrogen-bonding interactions, linking adjacent layers into a three-dimensional network.