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Figure 2
Overlay diagram of the dication in the title compound (red image), the neutral mol­ecule in its co-crystal (green), and dication in the literature salt (blue). The mol­ecules have been overlapped so that the O=C—C=O residues are coincident. The ring N atoms are indicated by an asterisk.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
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