The imidazole and pyridine rings in the title compd., C9H8N4O4, are twisted with respect to one another, with a dihedral angle of 48.30 (4)ÃÂ°. The nitro group is almost coplanar with the imidazole plane. The crystal packing involves some weak C-H...N and C-H...O hydrogen bonds, of which the strongest, between the imidazole CH group and a nitro O atom [H...O 2.396 (15) .ANG.], forms a centrosym. dimer.