Description_x000D_ Packaging_x000D_ 5, 25 mg in glass bottle_x000D_ Biochem/physiol Actions_x000D_ ML138 (CID 44601470) is a highly selective agonist at kappa opioid receptors (KOR) that potently activate G protein coupling but weakly interact with β arrestin2._x000D_ Features and Benefits_x000D_ This compound is a featured product for Neuroscience research. Click here to discover more featured Neuroscience products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.