BGC-20-1531 free base(Cat No.:I045050)is a highly selective and potent antagonist of the prostaglandin E₂ receptor subtype EP4. With nanomolar affinity (Kᵢ ~3 nM), it exhibits over 2500-fold selectivity over EP₂ and EP₃ receptors. This compound effectively inhibits PGE₂-induced vasodilation in human cerebral and meningeal arteries, making it a valuable tool in migraine and neurovascular research. It does not affect other vascular beds like coronary or renal arteries. BGC-20-1531 is used in preclinical studies to investigate inflammatory and pain pathways mediated by EP4 signaling, particularly in headache and neuroinflammation models.