BMS-986187 from MedChemExpress

BMS-986187 is an δ-opioid receptor-selective positive allosteric modulator (PAM) with an EC₅₀ of 0.03 µM and a pK_B of 6.02 (～1 µM). BMS-986187 has no observable PAM activity at the µ-receptor (EC₅₀=3 µM)