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The title compound, C22H27N7·4.5H2O, crystallizes with two molecules of 1,4-bis(benzimidazol-2-ylmethyl)-1,4,7-triazacyclononane and nine disordered water molecules in the asymmetric unit. Each triazacyclononane group exhibits an intramolecular N—H...N hydrogen bond. The crystal packing is dominated by N—H...O and O—H...N hydrogen bonds between organic molecules and water molecules, and also between water molecules.doi:10.1107/s1600536806011305 fatcat:3h4bzkbd6felzlqbbh3ax7wmoq