No abstract

In the title compound, C16H24N2O8, the mol­ecule is centrosymmetric. The crystal packing is stabilized by inter­molecular N—H⋯O hydrogen bonds.

Key indicatorsSingle-crystal X-ray study T = 292 K Mean (C-C) = 0.002 Å R factor = 0.052 wR factor = 0.120 Data-to-parameter ratio = 17.0For details of how these key indicators were automatically derived from the article, see

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 π–π stacking is observed.

The title compound, C21H23IN4O8, is a glycoluril derivative with five fused rings. An iodobenzene ring is fused to a seven-membered ring which binds two of the N atoms from separate rings of the glycoluril system. The other N atoms are linked via methylene groups to form an eight-membered ring with two ether O atoms separated by an additional methylene group. The crystal structure is stabilized by inversion-related C—H...π interactions together with C—H...O non-classical hydrogen bonds.