3-((4R,7S,10S,13S,16S,19R)-19-amino-7-(2-amino-2-oxoethyl)-4-((S)-2-(((S)-1-((2-amino-2-oxoethyl)amino)-4-methyl-1-oxopentan-2-yl)carbamoyl)pyrrolidine-1-carbonyl)-13-((S)-sec-butyl)-16-(4-hydroxybenzyl)-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentaazacycloicosan-10-yl)propanoic acid, 2,2,2-trifluoroacetic acid (1:1); [4-Glutamic acid]oxytocin; Glu-4-Oxytocin
