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Absorption spectra of compound 3a, 3b (2 × 10−5 mol/L) in the presence of calf thymus DNA (CT-DNA) in phosphate buffer containing. [DNA]: (a) 0; (b) 2 × 10−5 mol/L; (c) 4 × 10−5 mol/L; (d) 6 × 10−5 mol/L; (e) 8 × 10−5 mol/L; (f) 1 × 10−4 mol/L; (g) 1.2 × 10−4 mol/L.
