Fig. 1: Prior strategies and our synthetic design for the synthesis of peptides and proteins with three disulfide bonds.

a Oxidative folding under thermodynamic control, main limitations. b Stepwise deprotection and oxidation strategy, main limitations. c Ultrafast high-yielding formation of multiple disulfide bonds via our strategy (PG is abbreviation for protecting group, UV is abbreviation for ultraviolet-light and DSF is abbreviation for disulfiram).