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(A) The traceless Staudinger ligation; (B) 18F-labeling via the sydnone-alkyne cycloaddition; (C) 18F-labeling via sulfur-fluoride exchange (SuFEx) chemistry; (D) the bioconjugation of a [68Ga]Ga-DOTA-moiety via the RIKEN reaction. Colored spheres represent cargoes.
