The title compound, C(18)H(18)N(4)OS, has an almost planar 1,2,4-triazole ring [r.m.s. deviation = 0.0036 (2) Å], which makes dihedral angles of 78.5 (2) and 77.6 (11)° with the two phenyl rings. An intra-molecular N-H⋯S inter-action occurs. In the crystal, mol-ecules are linked by an inter-molecular three-centre N-H⋯(O,S) cyclic hydrogen-bonding inter-action.
