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Absorption titration of 12 (left), 11 (middle) and 10 (right) with increasing concentrations of CT-DNA (0–100 µM). Arrows show hypsochromic and hypochromic changes upon increasing CT-DNA concentration. Inset: plot of [DNA]/(εa − εf) versus [DNA]; ▪,experimental data points; solid line, linear fitting of the data.
