H-CYS-TYR-ILE-SER-ASN-CYS-PRO-ILE-GLY-NH2

L-Cys(1)-L-Tyr-L-Ile-L-Ser-L-Asn-L-Cys(1)-L-Pro-L-Ile-Gly-NH2

[4-Serine,8-Isoleucine]Oxytocin, [Ser4, Ile8]Oxytocin, Isotocin

(2S)-1-[(1R,4S,7S,13S,16R)-16-amino-4-(2-amino-2-keto-ethyl)-13-(4-hydroxybenzyl)-3,6,9,12,15-pentaketo-7-methylol-10-[(1S)-1-methylpropyl]-18,19-dithia-2,5,8,11,14-pentazacycloicosane-1-carbonyl]-N-[(1S,2S)-1-[(2-amino-2-keto-ethyl)carbamoyl]-2-methyl-butyl]pyrrolidine-2-carboxamide