Bis-4,9-diazapyrenium dications: synthesis of the methylenedibenzyl-analogue, interactions with nucleotides, DNA, RNA. The antitumour activity of all till now prepared analogues
polynucleotide secondary structure, yielding strong DNA over RNA preference. Appearance of ICD band of 3 was found to be specific for DNA polynucleotides and together with observed destabilisation of double stranded RNA is attributed to the aggregation of compound in one of the RNA grooves. All bis-4,9-diazapyrenium dications prepared till now have shown considerable antiproliferativeactivity against five human