BMS-986121, a positive allosteric modulator (PAM) of the μ opioid receptor. This compound is based on a novel chemical scaffold, introducing a new chemotype for μ receptor PAMs.

BMS-986121 (1 μM~1 mM) significantly augments the β-arrestin–recruitment response produced by a low concentration of endomorphin-I (PAM-detection mode). BMS-986121 significantly increases the inhibition of forskolin-stimulated adenylyl cyclase activity produced by a ～EC 10 (30 pM) concentration of endomorphin-I in CHOμ cells. BMS-986121 (100 μM) produces leftward shifts in the potency of endomorphin-I (fourfold), morphine (fivefold), and leu-enkephalin (sixfold), in inhibition of forskolin-stimulated cAMP-accumulation assays in CHO-μ cells[1].