1. Structure of Pressinoic Acid: The Cyclic Moiety of Vasopressin
2. The structure of oxytocin is Cys1-Tyr2-Ile3-Gln4-Asn5-Cys6-Pro7-Leu8-Gly9-NH2, containing a disulfide bridge between the two cysteine amino acids forming a hexapeptide ring. The structure of vasopressin differs in two positions: Phe3and Arg8. Both are neurohypophyseal hormones
3. H–H BDE = 104 kcal mol−1; C–C BDE = 79 kcal mol−1