Abstract
(His‐Ser‐Cys)1‐lysine‐vasopressin, (Ser‐His‐Cys)1‐lysine‐vasopressin, (His‐Ser‐Cys)1‐oxytocin and (Ser‐His‐Cys)1‐oxytocin have been synthesized by condensing dipeptide azides with nonapeptides. The first peptide was also prepared by reacting a pentapeptide azide with an hexapeptide. It exhibits a noteworthy ACTH‐releasing activity in vivo and a better specificity than lysine‐vasopressin.