Scheme 2.
Synthesis of Ac-αS1-18 V′3-Nbz (7). Reagents and conditions: (i) SPPS on Dbz AM resin, r.t., (ii) p-nitrophenyl chloroformate, r.t., (iii) DIPEA/DMF, r.t., and (iv) TFA/TIPS/thioanisole/DCM (80 : 5 : 2.5 : 12.5), r.t.
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