[(PF)PHE4]nociceptin(1-13)NH2

[(pF)Phe4]Nociceptin(1-13)NH2 is a highly potent and selective NOP receptor (OP4) agonist, with a pKi of 10.68 and a pEC50 of 9.31. [(pF)Phe4]Nociceptin(1-13)NH2 displays high selectivity over δ, κ, and μ opioid receptors (>3000 fold)[1][2].

[1] Rizzi A, et al. Pharmacological characterisation of [(pX)Phe4]nociceptin(1-13)NH2 analogues. 2. In vivo studies. Naunyn Schmiedebergs Arch Pharmacol. 2002;365(6):450-456. DOI:10.1007/s00210-002-0549-7
[2] Bigoni R, et al. Pharmacological characterisation of [(pX)Phe4]nociceptin(1-13)amide analogues. 1. In vitro studies. Naunyn Schmiedebergs Arch Pharmacol. 2002;365(6):442-449. DOI:10.1007/s00210-002-0548-8
[3] Guerrini R, et al. Structure-activity studies of the Phe(4) residue of nociceptin(1-13)-NH(2): identification of highly potent agonists of the nociceptin/orphanin FQ receptor. J Med Chem. 2001;44(23):3956-3964. DOI:10.1021/jm010221v