Bis(2-amino-3-nitro-pyridinium) dihydrogen-diphosphate.

The structure of the title compound, 2C(5)H(6)N(3)O(2) (+)·H(2)P(2)O(7) (2-), contains infinite (H(2)P(2)O(7) (2-))(n) layers stacked perpendicular to the a axis. The 2-amino-3-nitro-pyridinium cations are arranged in pairs and are anchored between these layers, linking them by N-H⋯O and C-H⋯O hydrogen-bonding and electrostatic inter-actions between anionic and cationic species to form a three-dimensional network.