We report a new serine/threonine ligation (STL)assisted diaminodiacid (DADA) strategy for the flexible construction of disulfide surrogates by the option of more abundant -Aa-Ser/Thr-ligation sites. The practicality of this strategy was evidenced by the synthesis of the intrachain disulfide surrogate of C-type natriuretic peptide and the interchain disulfide surrogate of insulin.
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