2,6-Diamino-3,5-dinitro-1,4-pyrazine 1-oxide

The title compound, C4H4N6O5, crystallizes in the monoclinic space group P21/n, and is an energetic compound containing only C, H, N, and O with a density of 1.919 Mg m−3. Among other reasons, this remarkably high density is attributed to an extensive system of intra- and intermolecular hydrogen bonds which results in a packing scheme involving zigzag sheets.