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The asymmetric unit of the title salt, C6H16NO+·C10H4ClN4O7·0.5H2O, contains two cations, two anions and one water mol­ecule. In one independent anion, one nitro group is rotationally disordered over two orientations in a 0.657 (8):0.343 (8) ratio. In the crystal, inter­molecular N—H...O and O—H...O hydrogen bonds link all the components into ribbons extending along [100].

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In the cation of the title hydrated salt, C11H9N4O4+·Cl·H2O, the six-membered rings are inclined to each other at 79.0 (1)° and an intra­molecular N—H...O hydrogen bond occurs. In the crystal, N—H...Cl hydrogen bonds link two cations and two anions into centrosymmetric group, and O—H...Cl hydrogen bonds involving the water mol­ecules further link these groups into chains in [101]. An O—H...O inter­action is also present. The water mol­ecule is disordered over two sets of sites in a 0.555 (13):0.445 (13) ratio
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