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Electronic absorption spectra of (A) berberine derivatives 1 and 2, (B) berberine and berberine derivative 3, (C) ciprofloxacin and berberine derivative 4, all in the mixed solvent DMSO/water (1:100, v:v; concentration 0.07 mM). Each graph contains the relative spectral distribution of the UVA LED source (λmax = 365 nm) applied in the EPR spin trapping experiments.
