Yang, Yu-Hua, et al. “Synthesis and Crystal Structure of 5-Methoxy-4’-Chloro-2,2’-[ethylenedioxybis(nitrilomethylidyne)]diphenol”. Asian Journal of Chemistry, vol. 26, no. 4, Feb. 2014, pp. 1133-5, doi:10.14233/ajchem.2014.16032.