Zu Pei, Liang, et al. “Synthesis and Structural Characterization of 4-Hydroxyanilinium 3,4,5,6-Tetrabromo-2-(methoxycarbonyl)benzoate Methanol Monosolvate”. Asian Journal of Chemistry, vol. 27, no. 7, Mar. 2015, pp. 2743-4, doi:10.14233/ajchem.2015.17995.