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We report the first pretargeting in vivo study using the Strain-Promoted Sydnone-Alkyne Cycloaadition (SPSAC) reaction. The injection of a fluorine-18 labeled cyclooctyne three days after cetuximab bearing chlorosydnone moieties allowed a significant detection of the tumor by PET imaging suggesting an efficient click reaction inside the tumoral site. With a kinetic constant superior to 300 M-1 s-1, the SPSAC reaction might be an interesting tool, in addition to tetrazine-cyclooctene ligation, for in vivo chemistry.
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Richard et al. (2019) studied this question.
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