(Deamino-Cys1,beta-cyclohexyl-Ala4,Arg8)-vasopressin

d[Cha4]-AVP is a potent and selective vasopressin (AVP) V1b receptor agonist with a Ki of 1.2 nM for human V1b receptor. d[Cha4]-AVP shows more selective for V1b receptor than human V1a receptor, V2 receptor, and oxytocin receptors[1][2].

[1] Ling Ling Cheng, et al. Design of potent and selective agonists for the human vasopressin V1b receptor based on modifications of [deamino-cys1]arginine vasopressin at position 4. J Med Chem. 2004 Apr 22;47(9):2375-88. DOI:10.1021/jm030611c
[2] Cristiana Griffante, et al. Selectivity of d[Cha4]AVP and SSR149415 at human vasopressin and oxytocin receptors: evidence that SSR149415 is a mixed vasopressin V1b/oxytocin receptor antagonist. Br J Pharmacol. 2005 Nov;146(5):744-51. DOI:10.1038/sj.bjp.0706383