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2L. Kozlov and I. Goldberg.
Hydrogen-bonding versus [pi]-[pi] stacking interactions in dipyrido[f,h]quinoxaline-6,7-dicarbonitrile and 6,7-dicyanodipyrido[f,h]quinoxalin-1-ium chloride dihydrate, Acta Cryst. (2008). C64, o498-o501Â Â Â Â