Acta Cryst. (2006). E62, o5419-o5420  [ doi:10.1107/S160053680604548X ]

Diethyl cis-4,5,10,11-tetrahydro-4,11-dioxo-1H,3H-2-oxa-3a,4a,10a,11a-tetraazabenz[f]indeno[2,1,7-ija]azulene-11b,11c-dicarboxylate

L.-P. Cao, M. Gao and B.-H. Zhou

Abstract: The title compound, C₂₀H₂₂N₄O₇, is a glycoluril derivative with five fused rings. A benzene ring is fused to a seven-membered ring which includes two of the N atoms from separate rings of the glycoluril system, and the other two N atoms are linked to an O atom by two methylene groups. The structure is stabilized by intermolecular C-HO hydrogen bonds.

Online 8 November 2006

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