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(A) Chemoselectivity of bicyclobutylsulfones for Cys side chains over other proteinogenic amino acids. (B) Superior selectivity of reagent 8g over N-ethylmaleimide 147. (C) Optimized conditions and substrate scope of Cys “cyclobutylation.” (D) Temporal control of Cys labeling using electronically distinct bicyclobutylsulfones.
