UDP glucuronic acid is a sugar used in the creation of polysaccharides and is an intermediate in the biosynthesis of ascorbic acid, generally，It is made from UDP-glucose by UDP-glucose 6-dehydrogenase. HEGENG by its own key technology and bioprocess system to synthesized necessary substrate for preparation of glycosaminoglycan oligosaccharides drug by Nucleotide activates D-glucuronic acid.