Used as a metabolite marker in pharmaceutical and toxicological studies to assess the metabolism and clearance of 8-hydroxyquinoline derivatives in biological systems. It aids in evaluating drug bioavailability and hepatic or renal excretion pathways due to its water-soluble nature conferred by the glucuronide moiety. Commonly detected in urine and plasma samples during metabolic profiling, it supports research on drug interactions and enzymatic activity related to glucuronidation, particularly involving UDP-glucuronosyltransferase enzymes. Its sodium salt form enhances stability and solubility for analytical use in HPLC and mass spectrometry applications.