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. 2015 Jan 23;6(3):1944–1948. doi: 10.1039/c4sc03388d

Scheme 1. Structure and sensing mechanism of SpiroZin probes. Replacement of a pyridine (X = CH) by a pyrazine ring (X = N) in the metal-chelating unit decreases the zinc binding affinity of the sensor, improving its dynamic range in live cells.17 .

Scheme 1