Synonyms: Oxytocin dihydrogen citrate;(2S)-1-[(4R,7S,10S,13S,16S,19R)-19-amino-7-(2-amino-2-oxo-ethyl)-10-(3-amino-3-oxo-propyl)-16-[(4-hydroxyphenyl)methyl]-6,9,12,15,18-pentaoxo-13-sec-butyl-1,2-dithia-5,8,11,14,17-pentazacycloicosane-4-carbonyl]-N-[(1S)-1-[(2-amino-2-oxo-ethyl)carbamoyl]-3-methyl-butyl]pyrrolidine-2-carboxamide; citric acid