1-Methyl-1′-(4-methyl­phen­yl)-2′,3′,5′,6′,7′,7a'-hexa­hydro-1′H-dispiro­[piperidine-3,2′-pyrrolizine-3′,3′′-indoline]-4,2′′-dione

The title compound, C₂₆H₂₉N₃O₂, crystallizes with two mol­ecules in the asymmetric unit, having C—H...O inter­actions between them and resulting in a dimer characterized by an R₂²(11) motif. These dimers are linked into an ABABAB chain via N—H...O, N—H...N and C—H...O built edge-fused R₁²(5) and R₂²(7) motifs. This chain is linked to its inversion-related partner via N—H...O bonds with an R²₂(8) motif and leads to a double chain extending along the b axis characterized by an R₆⁶(36) motif across the inversion centres. The methyl group of the phenyl ring and the oxindole of mol­ecule A and B are involved in C—H...π inter­actions. One C atom of the pyrrolizine ring of mol­ecule A and its attached H atoms show positional disorder, the major and minor components being in the ratio 0.706 (7):0.294 (7).