Diethyl 1,4-dioxo-6-(3-pyridyl)perhydro-2,3,4a,6,7a-pentaazacyclopenta[cd]indene-2a,7b-dicarboxylate1,2-dichoroethane solvate

The main residue of the title compound, C18H22N6O6 center dot C2H4Cl2, is a derivative of glycoluril. The six-membered heterocycle adopts a chair conformation and shares two N atoms with two five-membered rings of the glycoluril unit to form the flexible sidewalls of a molecular clip. Two ethyl fragments and the solvent molecule are disordered; the site occupancy factors for the ethyl groups are 0.72/0.28 and 0.75/0.25 and for the solvent molecule 0.54/0.46. Intermolecular N-H center dot center dot center dot O and N-H center dot center dot center dot N hydrogen bonds link the cyclopenta[ cd] indene molecules into two-dimensional layers parallel to the bc plane.