2-(4,5,6,7,8,9-Hexahydro-6a-Azaphenylen-2-Ethylene)Indan-1,3-Dione: Disorder in the Crystal Structure

The title compound, C22H19NO2, has potential for use as a new nonlinear optical material. Molecules are almost planar. One C atom of the heterocyclic ring system is disordered over two positions; the site occupancy factors are 0.6 and 0.4.