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Spectrophotometric titration upon the addition of ct DNA to the styrylquinolizinium derivatives 3a (A), 3b (B), 3c (C), and 3d (D) in BPE [cL = 20 µM, cDNA = 1.45 mM (A–C), cDNA = 2.45 mM (D), cDNA in base pairs]. The insets show the plots of absorption vs DNA concentration. The arrows indicate the changes of absorption upon the addition of ct DNA.
