Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Several new pyridazino[1′,6′:1,2]pyrido[3,4-b]indol-5-inium derivatives were synthesised from β-carboline derivatives and their cytotoxic activity and effect on the cell cycle were evaluated against L1210 cancer cells. ... New pyridazino[1′,6′:1,2]pyrido[3,4-b]indol-5-inium derivatives were ...