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Acta Cryst. (2005). E61, o2549-o2550  [ doi:10.1107/S1600536805022075 ]

Diethyl 6,9-dibromo-1,4-dioxo-1,2,3,4,5,10-hexahydro-2,3,4a,10a-tetraazabenzo[g]cyclopenta[cd]azulene-2a,10b-dicarboxylate

N.-F. She, H.-Z. Guo, Z.-G. Wang and A.-X. Wu

Abstract: The title compound, C18H18Br2N4O6, is an important intermediate for the synthesis of molecular clips. Intermolecular N-H...O hydrogen bonds form eight-membered rings. No [pi]-[pi] stacking is observed.

Online 16 July 2005

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