2‐Hydroxy­acetophenone 4‐phenyl­thio­semicarbazone

The title compound, C₁₅H₁₅N₃OS, exists in the thione form and adopts an E configuration about the hydrazine bond, which is in the Z form with respect to the thiocarbonyl bond. An O—H⋯N intra­molecular hydrogen bond promotes planarity in part of the mol­ecule.