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Synchronous fluorescence (Δλ = 15 nm) of of BSA (5 μM) with variable concentrations of compounds 1 (A), 2 (B), 3 (C), 4 (D), 5 (E), 6 (F), 7 (G) at the excitation wavelength (280 nm) at room temperature in 0.05 mol L−1 Tris-HCl, pH 7.4. The concentrations of compounds varied from 0 to 30 μM.
