HS666 is a selective κ opioid receptor partial agonist (Ki value of 5.9 nM) which activates central κ receptors to produce potent antinociception. Moreover, HS666 displays pharmacological characteristics of a κ receptor analgesic with reduced liability for aversive effects correlating with its low efficacy in the β-arrestin2 signalling pathway.

Keywords: HS666 hydrochloride | supplier | Kappa-opioid partial agonist | HS 666 hydrochloride | HS-666 hydrochloride | CAS [1409931-99-2] | [1409931-91-4] | Opioids | OPR-κ | Partial agonist | Receptors | Antinociception