Kynurenic acid (Standard) is the analytical standard of Kynurenic acid. This product is intended for research and analytical applications. Kynurenic acid, an endogenous tryptophan metabolite, is a broad-spectrum antagonist targeting NMDA, glutamate, alpha7 nicotinic acetylcholine receptor. Kynurenic acid is also an agonist of GPR35/CXCR8.