Acta Cryst. (2007). E63, o3374  [ doi:10.1107/S1600536807031819 ]

Diethyl 2,6-diethyl-4,8-dioxo-2,3,6,7-tetrahydro-1H,5H-2,3a,4a,6,7a,8a-hexaazacyclopenta[def]fluorene-8b,8c-dicarboxylate

L.-P. Cao, Y.-Z. Wang and M. Gao

Abstract: The title compound, C₁₈H₂₈N₆O₆, is a derivative of glycoluril, with two ethyl acetate substituents on the convex face of the glycoluril system. Two equivalent six-membered rings bind the N atoms from separate rings of the glycoluril unit to form the flexible sidewalls of a molecular clip. One N atom from each ring carries an ethyl substituent. The crystal packing is stabilized by non-classical C-HO hydrogen bonds.

Online 5 July 2007

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