Atosiban   

Structure:

CAS Number: 90779-69-4

Molecular formula: C43H67N11O12S2
Molar mass: 994.2 g/mol

Medical use: Atosiban is an oxytocin receptor antagonist used to inhibit preterm labor by reducing uterine contractions. It helps delay premature birth, allowing more time for fetal development or other medical interventions.