An unknown solvate of 1-(2,4-di­chloro­benz­yl)-4-[(4-methyl­phen­yl)sulfon­yl]piperazine

In the title compound, C(18)H(20)Cl(2)N(2)O(2)S, the piperazine ring adopts a chair conformation. The dihedral angle between the sulfonyl-bound benzene ring and the best-fit plane through the six non-H atoms of the piperazine ring is 72.22 (12)°; those between the di­chloro­benzene ring and the sulfonyl and piperazine rings are 2.44 (13) and 74.16 (2)°, respectively. In the crystal, mol­ecules are connected through weak C—H⋯O inter­actions into a hexa­meric unit generating a R (6) (6)(60) motif in the ab plane. The mol­ecules are also connected into C(4) chains through weak C—H⋯N inter­actions. The solvent used to grow the crystal was a mixture of di­chloro­methane and methanol, but the resulting electron density was uninter­pretable. The solvent contribution to the scattering was removed with the SQUEEZE routine in PLATON [Spek (2009 ▶). Acta Cryst. D65, 148–155]. The formula mass and unit-cell characteristics do not take into account the disordered solvent.