CAS Number: 50-56-6 Molecular formula:C43H66N12O12S2 Molar mass: 1007.19 Sequence: H-Cys-Tyr-IIe-Gln-Asn-Cys-Pro-Leu-Gly-NH2 (Disulfide Bridge:1-6) Medical use: Oxytocin is used in labor induction and spawning induction. It is uterine tonic. Oxytocin comes from the extraction from the posterior lobe of the pituitary gland or chemical synthesis.