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The radio-HPLC chromatogram of the radiolabeling solution after 15 min at 80 °C. The retention time of the peak corresponding to [45Ti]salan-Ti-CA-PSMA ([45Ti]-3) was 7.9 min. Insert: The UV signal at 420 nm of the HPLC chromatogram for the nonradioactive Salan-Ti-CA-PSMA (3). The retention time was 7.7 min. The time difference is due to the radioactivity detector being placed after the UV detector.
