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Glycogen synthase kinase‐3 α/β is involved in dysregulation of neuronal tau protein in Alzheimer's disease (AD). There is an unmet clinical need for a blood‐brain barrier (BBB) permeable positron emission tomography (PET) probe for imaging of GSK‐3α/β in the brain to understand the pathogenesis of AD. Herein, we synthesized two PET probes, [18F]F‐CNBI and [18F]F‐CNPIFE, and evaluated their BBB permeability...