Synonyms: Oxpleu;1-{[(4r,7s,10s,16s,19r)-19-amino-7-(2-amino-2-oxoethyl)-13-[(2s)-butan-2-yl]-16-(4-hydroxybenzyl)-20,20-dimethyl-10-(2-methylpropyl)-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentaazacycloicosan-4-yl]carbonyl}prolyl-l-leucylglycinamide;6367-90-4;AC1L4SJJ;1-Penicillamyl-4-leu-oxytocin;KST-1B6750;AR-1B9559;Oxytocin, penicillamyl(1)-leu(4)-;Oxytocin, penicillamyl(1)-leucine(4)-;Oxytocin, 1-(3-mercapto-L-valine)-4-L-leucine-;1-[(4R,7S,10S,16S,19R)-19-amino-7-(2-amino-2-oxoethyl)-13-[(2S)-butan-2-yl]-16-[(4-hydroxyphenyl)methyl]-20,20-dimethyl-10-(2-methylpropyl)-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