“SYNTHESIS AND STUDY OF N,N1 - HEXAMETHYLENE BIS- {[(4,41-DIMETHYLDIPHENYL)-AZO-2,21-DIAMINO] UREA} PROPERTIES, APPLICATIONS” (2022) Journal of Pharmaceutical Negative Results, pp. 3265–2378. doi:10.47750/pnr.2022.13.S06.441.