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A ratiometric fluorescent probe 2‐(benzimidazol‐2‐yl)phenyl phosphoric acid (1) for alkaline phosphatase (ALP) is designed and synthesized. The method employs the modulation of the excited‐state intramolecular proton transfer (ESIPT) process of 2‐(2'‐hydroxyphenyl)benzimidazole (HPBI) through the hydroxyl group protection/deprotection reaction. Upon phosphorylated with POCl3, HPBI shows only an emission...