2,4,6,8-Tetraazabicyclo[3.3.1]nonane-3,7-dione and 2,4,6,8-Tetraacetyl-2,4,6,8-tetraazabicyclo[3.3.1]nonane-3,7-dione

The title compounds, 2,4,6,8-tetraazabicyclo[3.3.1]nonane- 3,7-dione, (I) (C₅H₈N₄O₂), and 2,4,6,8-tetraacetyl-2,4,6,8- tetraazabicyclo[3.3.1]nonane-3,7-dione, (II) (C₁₃H₁₆N₄O₆), display similar conformations with the cyclic urea moieties and bridgehead atoms forming two mean planes having a dihedral angle of approximately 110°. The CO of each acetyl group is anti to the CO of the cyclic urea to which it is attached.

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