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Use of the SEA‐linker for peptide thioester Fmoc SPPS. (i) SPPS; (ii) standard TFA cleavage; (iii) iodine oxidation; (iv) N,S‐acyl shift: 0.2 M tris(2‐carboxyethyl)phosphine/MPAA; (v) R‐SH, NaSPh; (vi) 6 M guanidine, phosphate buffer pH 7.8, 1% thiophenol.
