Hui-Zhen Guo

Diethyl 2-tert-butyl-6,9-dibromo-4,11-dioxo-5,10-dihydro-cis-1H,3H,4H,11H-2-azo-3a,4a,10a,11a-tetra-aza-benz[f]indeno[2,1,7-ija]azulene-11b,11c-dicarboxyl-ate.

In the title compound, C24H29Br2N5O6, a glycoluril derivative, the 1,4-dibromobenzene ring is fused to the seven-membered ring of the glycoluril unit containing two N atoms. The two five-membered rings in the glycoluril unit are approximately planar and the dihedral angle between them is 69.8 (2)°. The six-membered ring containing three N atoms adopts a chair conformation. The crystal packing is stabilized by an intermolecular non-classical C—H⋯O hydrogen bond and a weak C—H⋯π interaction. Both of the ester groups are found to be disordered over two positions. The occupancies of the disordered positions were refined to 0.73(1):0.27(1) and 0.56(1):0.44(1).