(Z)-2-[(4-Methyl-phen-yl)sulfon-yl]-1,2-diphenyl-ethene-selenol.

In the title compound, C(21)H(18)O(2)SSe, the dihedral angle between the cis phenyl rings is 64.3 (1)° and those between the toluene and the phenyl rings are 21.1 (2) and 72.0 (1)°, respectively. An intra-molecular Se-H⋯O hydrogen bond occurs. In the crystal, mol-ecules are connected by C-H⋯O hydrogen bonds and weak C-H⋯π inter-actions help to consolidate the crystal packing.