Acta Cryst. (2009). E65, o674  [ doi:10.1107/S1600536809005157 ]

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

J. Ding, X. Ren, Y. Zhu, N. She and A.-X. Wu

Abstract: The title molecule, C₂₈H₂₈Cl₄N₆O₆, is built up from four fused rings, viz. two nearly planar imidazole five-membered rings which adopt envelope conformations with the C=O groups at the flap position, and two triazine six-membered rings which adopt chair conformations. Each six-membered ring has a 2,4-dichlorobenzyl substituent attached to an N atom. In the molecule, the two ethyl groups are each disordered between two orientations in 0.784 (16)/0.216 (16) and 0.631 (10)/0.37 (10) ratios. Weak intermolecular C-HO hydrogen bonds help to stabilize the crystal packing.

Online 6 March 2009

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