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Figure 3: Fluorescence spectra of (a, b) gemifloxacin (1000 ng/mL) with acetylacetone-formaldehyde reagent solution, (a′, b′) acetylacetone-formaldehyde reagent, where (a, a′) are the excitation spectra and (b, b′) are the emission spectra. λex/λem = 420/476 nm.