1-Mpa-cyclo(4-glu-8-lys)-oxytocin 125666-62-8 Oxytocin, 1-(3-mercaptopropanoic acid)-4-L-glutamic acid-8-L-lysine-, cyclic(4-8)-peptide Oxytocin, beta mercaptopropionic acid(1)-cyclo(glutamyl(4)-lysyl(8))- Oxytocin, mpa(1)-cyclo(glu(4)-lys(8))-