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Radioactivity-HPLC chromatograms of the radiotracer (S)-[18F]3 incubated, for 0, 1, and 2 h post formulation, at room temperature in ethanol, NaCl 0.9% containing 5% ethanol, and DPBS (pH 7.4) containing 5% ethanol, as well as in a mixture of DPBS and mouse serum at 37 °C.
