Crystal structure of (1′S,2′S,3S)-1′-benzoyl-2′-(4-meth­oxy­phen­yl)-1-methyl-2′,5′,6′,10b′-tetra­hydro-1′H-spiro­[indoline-3,3′-pyrrolo­[2,1-a]isoquinolin]-2-one

In the title spiro compound, C(34)H(30)N(2)O(3), the central pyrrolidine ring is fused with the tetra­hydro­iso­quinoline ring, both having distorted envelope conformations, with the flap atoms being C and N, respectively. The meth­oxy­phenyl group is attached to the pyrrolidine ring, and is disordered over two positions, with refined occupancies of 0.638 (6):0.362 (6) Å. The central pyrrolidine ring is inclined relative to the tetra­hydro­iso­quinoline group, such that the dihedral between the non-flap atoms of each ring system is 11.29 (7)°. The spiro-linkage creates a dihedral angle of 83.26 (5)° between the indolinone ring and the non-flap atoms of the pyrrolidine ring. In the crystal, mol­ecules are linked via C—H⋯O hydrogen bonds. For the major disorder component, these form C(11) chains that propagate parallel to the a axis.