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In the title hydrated mol­ecular salt, 2C4H16N33+·P6O186−·2H2O, the complete cyclo­hexa­phosphate anion is generated by crystallographic inversion symmetry. The six P atoms of the P6O186− anion form a chair conformation and the organic cation has a corrugated linear geometry. In the crystal, the cations and the anions are connected by N—H...O hydrogen bonds into slabs propagating in the ac plane. The water mol­ecules link the slabs by accepting N—H...O links and forming O—H...O links. The triclinic polymorph was reported by Gharbi et al. [(1995). J. Solid State Chem. 114, 42–51].
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