YANG, JUN, et al. “Synthesis and Crystal Structure of 1-(2-(1H-Benzoimidazol-1- yl)ethyl)-1H-Benzoimidazol-3-Ium Chloride Hydrate”. Asian Journal of Chemistry, vol. 22, no. 3, Mar. 2010, pp. 1689-92, https://asianpubs.org/index.php/ajchem/article/view/11322.