Fig. 7. Effect of compound 7a on HSA UV-vis absorption, c(HSA) = 1.0 × 10^–5 mol L^–1; c(compound 7a)/(10^–5 mol L^–1): 0, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75 (T = 298 K, pH = 7.4). The inset corresponds to the absorbance at 278 nm with different concentrations of compound 7a.