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Reagents and conditions: (i) [18F]potassium fluoride, Kryptofix222, potassium carbonate, dimethyl sulfoxide, r.t., 10 min; (ii) 2M potassium hydroxide in water, 105 °C, 10 min; (iii) zinc power, ammonium chloride, water, 105 °C, 5 min. Overall decay-corrected radiochemical yield: 30–40% (n = 3).
