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In the title compound, C(15)H(10)N(4)O(10), the dihedral angle between the aromatic rings is 89.05 (16)°. One O atom of one of the nitro groups is disordered over two sites in a 0.70:0.30 ratio. In the crystal, the mol-ecules are linked by weak C-H⋯O inter-actions.

The cation and anion of the title mol-ecular salt, C(7)H(10)NO(+)·C(6)H(2)N(3)O(8) (-), are linked via an N-H⋯O hydrogen bond. An intra-molecular O-H⋯O hydrogen bond is also found in the anion. In the crystal, the anions self-assemble via O-H⋯O hydrogen bonds, forming a C(9) supra-molecular chain the b axis. Further inter-molecular N-H⋯O inter-actions also occur.

In the title mol-ecular salt [systematic name: triethylammonium 5-(2,4-dinitrophenyl)-2,6-dioxo-1,2,3,6-tetrahydropyrim-idin-4-olate], C(6)H(16)N(+)·C(10)H(5)N(4)O(7) (-), the cation and anion are linked by an N-H⋯O hydrogen bond. In the crystal, inversion-related barbiturate rings are centrosymmetrically connected through pairs of N-H⋯O hydrogen bonds, forming R(2) (2)(8)R(2) (2)(8) ring motifs.