Synonyms: Oxypressin;3-Phe-oxytocin;Oxytocin, phe(3)-;AC1L4VBA;Oxytocin, phenylalanine(3)-;Oxytocin, 3-L-phenylalanine-;Cys-tyr-phe-gln-asn-cys-pro-leu-glynh2;Cysteinyl-tyrosyl-phenylalanyl-glutaminyl-asparaginyl-cysteinyl-proly-leucyl-glycinamide;(2S)-1-[(4R,7S,10S,13S,16S,19R)-19-amino-7-(2-amino-2-oxoethyl)-10-(3-amino-3-oxopropyl)-13-benzyl-16-[(4-hydroxyphenyl)methyl]-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentazacycloicosane-4-carbonyl]-N-[(2S)-1-[(2-amino-2-oxoethyl)amino]-4-methyl-1-oxopentan-2-yl]pyrrolidine-2-carboxamide