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Figure 1 The molecular structure of the title compound, with 50% probability displacement ellipsoids and the atom-numbering scheme. The dication is shown in open bonds. Unlabelled atoms in the dication are related to the labelled atoms by the symmetry operation (- x, 1 − y, 1 − z). H atoms of cations were omitted for clarity. The monocation and dication have fractional occupancies of 0.75 and 0.25, respectively. |