- Diffraction Ltd, Yarnton, G. M. England. Sheldrick
- A64, 112–122. Spek, A. L. (2009). Acta Cryst. D65…
In the crystal of the title compound, C(16)H(12)Cl(2)N(2)O(2), the two C=O groups are anti to each other, while one of them is syn and the other is anti to their adjacent C-H bonds. The two benzene rings are oriented at an inter-planar angle of 56.4 (1)°, while the dihedral angles between the central amide group (N-C-C-C-C-N) and these rings are 3.6 (1) and 54.1 (1)°. An intra-molecular N-H⋯O hydrogen bond occurs. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into infinite chains along the a axis.