Synonyms: Oxytocin,8-L-arginine-9a-glycine-; 1,2-Dithia-5,8,11,14,17-pentaazacycloeicosane, cyclicpeptide deriv.; Glycine,L-cysteinyl-L-tyrosyl-L-isoleucyl-L-glutaminyl-L-asparaginyl-L-cysteinyl-L-prolyl-L-arginylglycyl-,cyclic (1®6)-disulfide; Hydrin 2