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Synthesis of NBD-derived compounds. Reagents and conditions: (i) Na2S, MeOH, room temperature, 0.5 h; (ii) NAC, EtOH/H2O 4:1 (v/v), room temperature, 3 h; (iii) L-Cys, EtOH/H2O 4:1 (v/v), room temperature, 3 h; (iv) GSH, EtOH/H2O 4:1 (v/v), room temperature, 3 h.
