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Time course experiment of compound 2 (0.1 mM, A) and 3 (0.1 mM, B) reacting with NaHS in sodium phosphate buffer (pH = 7.4) at room temperature. Time points represent time range from 1 to 10 min after addition of NaHS (0.1 mM). Fluorescence spectra of compound 1 (C), 2 (A) and 3 (B) were recorded for 10 min after addition of NaHS (0.1 mM).
