Wang, L. et al. 2013. Synthesis and Crystal Structure of 5,5’-Dinitro-2,2’-[(1,4-butylene)dioxybis(nitrilomethylidyne)]diphenol. Asian Journal of Chemistry. 25, 6 (Jan. 2013), 3437–3439. DOI:https://doi.org/10.14233/ajchem.2013.13920.