Glyoxal 4-nitrophenylhydrazone: triple helices linked into a three-dimensional channel structure.

The molecules of the title compound, C8H7N3O3, which are nearly planar, are linked by an N-H...O hydrogen bond into helical chains, three of which are required to define the structure completely. These triply intertwined helices are linked by a C-H...O hydrogen bond into a three-dimensional framework enclosing two distinct types of channel, with average cross-sectional areas of 15.0 and 8.2 A2.