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. Author manuscript; available in PMC: 2021 Jul 30.
Published in final edited form as: Bioconjug Chem. 2020 Sep 30;31(10):2288–2292. doi: 10.1021/acs.bioconjchem.0c00453

Figure 1.

Figure 1.

Formation and characterization of crystal structure of the bioorthogonal adduct in NAB—TAS coupling. (A) Previously proposed reaction mechanism with a planar trigonal boronic ester adduct. (B) ORTEP representation of crystallographic analysis of the reaction adduct (4). (C) Newly proposed mechanism incorporating double condensation reaction.