Scheme 2. (a) 2,2′-Dithiopyridine, MeOH, 5 h, rt; 70%; (b) Bac7(1-35)[Cys36]-OH (5), DMSO:H2O (1:4), 24 h, rt, 21%. or Bac7(1-15)[Cys16]-NH2 (Not Reported in Figure) to yield (6), 12.5%.
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