1-(4-Carb­oxy­butan-2-yl­idene)-4-phenyl­thio­semicarbazide

The mol­ecule of the title compound, C(12)H(15)N(3)O(2)S, which belongs to the family of thio­semicarbazones, containing an acid group, adopts a semi-closed conformation with an intramolecular N—H⋯N hydrogen bond. In the crystal, molecules are linked by strong N—H⋯O and O—H⋯S hydrogen bonds between the acid group and thiosemicarbazone unit, with one additional intermolecular hydrogen C—H⋯O interaction. These three interactions form R (2) (2)(8) and a R (2) (1)(7) rings and the molecules related by the c-glide plane are linked into a zigzag chain along [001].