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Probes to monitor esterase activity. (A) Probes developed in our laboratory that are based on a core chromophoric alcohol and a condensed acid.17–20 (B) Probes based on a core chromophoric acid and a condensed alcohol.13–15 (c) Basis for the probe developed herein. The coordination mode of the 2TA·Tb3+ complex in aqueous media is unknown.
