Crystal structure of 5′′-benzyl­­idene-1′-methyl-4′-phenyl­tri­spiro­[ace­naphthyl­ene-1,2′-pyrrolidine-3′,1′′-cyclo­hexane-3′′,2′′′-[1,3]dioxane]-2,6′′-dione

In the title compound, C36H31NO4, 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 flap, whereas the dioxalane and pyrrolidine rings each have a twist conformation. The cyclo­hexa­none ring assumes a boat conformation. Three intra­molecular C—H⋯O hydrogen bonds involving both ketonic O atoms as acceptors are present. In the crystal, C—H⋯O hydrogen bonds connect centrosymmetrically related mol­ecule into chains parallel to the b axis, forming rings of R22(10)and R22(8) graph-set motifs.