[2.2]Dihydro­isobenzothio­phenophane

In the unit cell of the title compound, 1¹,1³,4¹,4³-tetra­hydro-1,4(4,7)-di(benzo[c]thio­phena)cyclo­hexa­phane, C₂₀H₂₀S₂, there are four independent but closely similar mol­ecules, each with crystallographic inversion symmetry. The packing is inter­preted in terms of layers formed via C—H...π inter­actions.