1. For example, L-iduronic acid ( C-5 ) are epimers of glucuronic acid . 2. Glucuronic acid is a precursor of ascorbic acid ( vitamin C ).3. Release of D-glucuronic acid is achieved in the fourth step. 4. It is activated in the liver but quickly deactivated by conjugation to glucuronic acid . 5. By the UDP-?-D-glucuronic acid ( UDPGA ) predominates. 6. The main metabolic route is esterification of the phenolic group with sulfuric acid and glucuronic acid . 7. The pyranose form of D-glucose and its derivative D-glucuronic acid prefer the chair 4 C 1. 8. Sulfonamides are usually metabolized by several oxidative pathways, acetylation, and conjugation with sulfate or glucuronic acid . 9. The repeating unit ( except for uronic sugar ( glucuronic acid or iduronic acid ) or galactose. 10. Codeine and its metabolites are excreted almost entirely by the kidney, mainly as conjugates with glucuronic acid .