1-Penicillamyl-2-phe-4-thr-oxytocin 1-Ppt-oxytocin 78578-27-5 Oxytocin, 1-(3-mercapto-D-valine)-2-L-phenylalanine-4-L-threonine- Oxytocin, 1-penicillamyl-phe(2)-thr(4)- Oxytocin, 1-penicillamyl-phenylalanyl(2)-threonine(4)-