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One-pot N-terminal conjugation of a hexapeptide by SPANC: a) 1. NaIO4, NH4OAc buffer, pH 6.8, room temperature, 1 h; 2. p-MeOC6H4SH, room temperature, 1 h; then p-MeOC6H4NH2, MeHNOH⋅HCl, room temperature, 20 min; b) 2, room temperature, 1 h.
