1(beta-Mercapto(beta,beta-cyclopentamethylene)propionic acid)-2-phe(Me)-4-thr-8-orn-oxytocin 110220-69-4 Oxytocin, 1-(beta-mercapto-(beta,beta-cyclopentamethylene)propionic acid)-methylphenylalanyl(2)-threonyl(4)-ornthine(8)- Oxytocin, 1-(beta-mercapto-(beta,beta-cyclopentamethylene)propionic acid)-phe(Me)(2)-thr(4)-orn(8)- Ppto-OT