Synthesis and structure of (Z)-2-(eth-oxy-methyl-idene)-8-methyl-2,3,4,9-tetra-hydro-1H-carbazol-1-one.

In the title compound, C16H17NO2, the cyclo-hexene ring adopts an envelope conformation and the side chain is extended. In the extended structure, N-H⋯O hydrogen bonds connect the mol-ecules into [100] chains and weak C-H⋯O inter-actions and pairwise C-H⋯π inter-actions consolidate the packing. A Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H⋯H (57.6%), C⋯H/H⋯C (24.2%), and H⋯O/ O⋯H (13.8%) contacts. Evaluation of the electrostatic, dispersion and total energy frameworks indicates that the cohesion of the crystal largely depends on dispersion energy contributions.