Acta Cryst. (2006). E62, o4872-o4873  [ doi:10.1107/S1600536806040256 ]

Diethyl 5,10-dihydro-6-phenylethynyl-4,11-dioxo-cis-1H,3H,4H,11H-2-oxa-3a,4a,10a,11a-tetraazabenz[f]indeno[2,1,7-ija]azulene-11b,11c-dicarboxylate

Y.-F. Chen and Y.-F. Cui

Abstract: The title compound, C₂₈H₂₆N₄O₇, (I) crystallizes with two molecules in the asymmetric unit. It is a glycoluril derivative with five fused rings. A phenylethynyl-substituted benzene ring is fused to a seven-membered ring, which binds two of the N atoms from separate rings of the glycoluril system. The other two N atoms are each linked to an O atom by methylene groups, forming a six-membered ring. The crystal structure is stabilized by intermolecular C-HO hydrogen bonds.

Online 7 October 2006

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