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Radio-HPLC analyses. (A) Purified 18F-9 after incubation in PBS for 2 h at 37 °C. (B) Combination of 18F-9 with 12 gives two major isomeric adducts 18F-15. (C) The slow eluting isomer of 18F-15 after purified by HPLC, incubation in PBS for 2 h at 37 °C, and reanalysis.
