PSB-22269 is identified as a GPR17 antagonist with a Ki value of 8.91 nM. It exhibits significant inhibitory effects in cAMP and G protein activation assays. Molecular docking studies indicate that the binding site of PSB-22269 includes positively charged arginine residues and a hydrophobic pocket. PSB-22269 promotes myelin regeneration strategies, offering potential for multiple sclerosis research.