Crystal structure of 5′′-(4-chloro­benzyl­idene)-4′-(4-chloro­phen­yl)-1′-methyltri­spiro[acenapthylene-1,2′-pyrrolidine-3′,1′′-cyclo­hexane-3′′,2′′′-[1,3]dioxane]-2(1H),6′′-dione

In the title compound, C36H29Cl2NO4, two spiro links connect the methyl-substituted pyrrolidine ring to the ace­naphthyl­ene and cyclo­hexa­none rings. The cyclo­hexa­none ring is further connected to the dioxalane ring by a third spiro junction. The five-membered ring of the ace­naphthylen-1-one ring system adopts a flattened envelope conformation, with the ketonic C atom as the flap, whereas the dioxalane and pyrrolidine rings each have a twist conformation. The cyclo­hexenone ring assumes a boat conformation. An intra­molecular C—H⋯O hydrogen-bond inter­action is present. In the crystal, mol­ecules are linked by non-classical C—H⋯O hydrogen bonds, forming chains extending parallel to the a axis.