(1-Penicillamine,2-p-methyl-phenylalanine,4-threonine,8-ornithine)vasotocin 1-Pen-2-(mephe)-4-thr-8-orn-oxytocin 106128-84-1 Opmpto Oxytocin, 1-(3-mercapto-L-valine)-2-(4-methyl-L-phenylalanine)-4-L-threonine-8-L-ornithine- Oxytocin, pen(1)-(4-mephe)(2)-thr(4)-orn(8)- Oxytocin, penicillaminyl(1)-(4-methylphenylalanyl)(2)-threonyl(4)-ornithine(8)- P(Phe(Me)(2),thr(4))ovt