3-Hydroxyanthranilic Acid Hydrochloride

In the structure of the title compound, 2-carboxy-6-hydroxyanilinium chloride, C7H8NO3+.Cl−, the amino group is protonated and the plane of the carboxyl group is nearly coplanar with that of the phenol ring. The molecules are held together by direct hydrogen bonds between protonated amino and carboxyl groups, as well as by indirect ones via Cl atoms using all available hydrogen bonds.