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Schematics of an assortment of click chemistry ligations (beyond those depicted in Figure 1) used for prosthetic group radiolabelings: (A) traceless Staudinger ligation, (B) nitrone–alkene cycloaddition, (C) nitrile–oxide cycloaddition, (D) 1,2-aminothiol–cyanobenzothiazole condensation, and (E) phenyloxadiazole methylsulfone–thiol conjugation.
