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Selective incorporation of the SCH2‐3‐oxetane motif into proteins as a Cys temporary protecting group. a) General strategy with 9. b) Protein scope with C2Am, AnxV, and rHSA. c) Schematic representation of the deprotection step (SCH2‐Ox→Cys) with several P‐, N‐, and S‐nucleophiles and unreactive controls using Sac (see the Supporting Information for details). § Multiple additions observed upon incubation with >50 equiv of 9.
