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In the title barbiturate salt (trivial name: trimethyl­ammonium 2,4,6-trinitro­phenyl­barbiturate), C3H10N+·C10H4N5O9, the asymmetric unit contains two sets of anion–cation moieties. The dihedral angle between the rings in the anions are 44.0 (3) and 45.7 (3)°. Adjacent anions are connected into ribbons along [100] through R22(8) ring motifs formed by N—H...O hydrogen bonds involving the barbiturate rings. Attached to both sides of these ribbons via N—H...O hydrogen bonds are the trimethyl­ammonium cations. C—H...O hydrogen bonds are also observed.
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