In the title compound, C(23)H(20)N(2)O(3)·CH(3)OH, the hexa-hydro-1H-benzo[f]isoindole and indoline rings are planar, with maximum deviations of 0.092 (1) and -0.095 (1) Å, respectively. The dihedral angle between these two rings is 88.03 (4)°. An O-H⋯N inter-action links the main mol-ecule and the methanol solvent mol-ecule. An intra-molecular C-H⋯O inter-action forms an S(6) ring motif. In the crystal, the mol-ecules form two-dimensional layers parallel to the bc plane through N-H⋯O and C-H⋯O inter-actions.