OVTA

b-Mercapto-b,b-cyclopentaMethylene-propionyl-Tyr(Me)-Ile-Thr-Asn-Cys-Pro-Orn-Tyr-NH2

vasotocin, (beta-mercapto-beta,beta-cyclopentamethylenepropionic acid)-O-methyl-Tyr(2)-Thr(4)-Orn(8)-Tyr(9)-NH2