Acta Cryst. (2005). E61, o4128-o4129  [ doi:10.1107/S1600536805037050 ]

Dimethyl 2,6-di-tert-butyl-4,8-dioxo-1,2,5,6-tetrahydro-2,3a,4a,6,7a,8a-hexaazacyclopenta[def]fluorene-8b,8c-dicarboxylate

Y.-T. Li, Z.-G. Wang, Y.-F. Chen and A.-H. Chen

Abstract: The title compound, C₂₀H₃₂N₆O₆, is a glycoluril derivative. The molecule is built up from four fused rings, namely two nearly planar imidazole five-membered rings and two non-planar triazine six-membered rings. In the five-membered imidazole rings, the N-C_carbonyl bond distances are much shorter than the other N-C distances, indicating - conjugation within the nearly planar ring. Both six-membered rings display chair conformations.

Online 16 November 2005

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