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(a) Circular dichroism spectra of CT-DNA (6.0 × 10−4 mol/L) in the presence or absence of compound 1a in Tris-HCl buffer (pH 7.2) at 20 °C. (b) Circular dichroism spectra of CT-DNA (6.0 × 10−4 mol/L) in the presence or absence of compound 2c in Tris-HCl buffer (pH 7.2), at 20 °C.
