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B. Koleva, T. Tsanev, T. Kolev, H. Mayer-Figge and W. S. Sheldrick.
3,4-Diaminopyridinium hydrogen squarate
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Acta Cryst. (2007). E63, o3356Â Â Â Â
[DOI: 10.1107/S1600536807031170]