The ΔT_m^a values (°C) of studied ds-polynucleotides upon addition of ratio r^b = 0.3 and of 15a–c, 16a, 16c, 17a, 21a and 21b at pH 7.0 (sodium cacodylate buffer, I = 0.05 mol dm⁻³).

r b = 0.3	15a	15b	15c	16a	16c	17a	21a	21b
ctDNA	3.3	2.4	1.6	4.4	2.6	3.8	0	0
Poly A–poly U	3.7	1.0	0	0	0	0	NDc	NDc
Poly(dA–dT)2	16.9	16.0	16.9	11.0	12.1	11.9	3.1	3.8

^aDifference between T_m value of free polynucleotide and complex with a small molecule; error in ΔT_m: ±0.5 °C.

^b r = [compound]/[polynucleotide].

^cNot determined.