Crystal structure and Hirshfeld surface analysis of 7,7-dimethyl-2-phenyl-3,3a,4,6,7,8,9,9a-octa­hydro-1H-benzo[f]iso­indole-1,5(2H)-dione

The title compound, C(20)H(23)NO(2), was obtained via the reaction of N-allyl-N-phenyl­acryl­amide with 3-iodo­cyclo­hex-2-en-1-one using PdCl(2)(PPh(3))(2) as a catalyst. The compound crystallizes in the monoclinic space group P2(1)/c. The fused-ring system is not planar and the five- and six-membered rings are trans-fused. The mol­ecular geometry is partially stabilized by an intra­molecular C—H⋯O hydrogen bond, forming an S(6) ring motif. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯π inter­actions into a three-dimensional network. To further analyse the inter­molecular inter­actions, a Hirshfeld surface analysis was performed. The results indicate that the most important contributions to the overall surface are from H⋯H (65.5%), O⋯H/H⋯O (17.5%) and C⋯H/H⋯C (14.3%) inter­actions.