Compositions and methods for producing vasodilation and antioxytocic activity

摘要

Vasopressin derivatives having V1 and oxytocin antagonist activity whose structures are characterized by a Mpa unit at position 1 and a des-Pro unit at position 7 are prepared by standard peptide synthetic methods also using an oxidative cyclization of a dimercaptan. Representative species are [1-deaminopenicillamine-2-(O-methyl)-tyrosine-7-desproline-8-arginine- 9-desglycine]vasopressin or [1- beta -mercaptopropionic acid-2-D-(O-ethyl)tyrosine-3-isoleucine-4-threonine-7-desproline-8-arg inine-9-desglycine]-vasopressin.