It is a quinolone derivative.It has been reported as metabolite of 8-hydroxyquinoline-N-oxide in rabbits. Synthesis of 2,8-quinolinediol has been reported. It is reported as one of the six possible forms of 8-hydroxycarbostyril.It has been detected as new UV-absorbing compound (UAC) in cow milk and its structure was elucidated using HRMS and by 1H, 13C and 1H ×13C NMR.It is also known as 8-hydroxycarbostyril or 8-hydroxyquinolin-2(1H)-one. It is suitable for use as standard in a study to identify the urinary metabolites for the toxicity related processes and pathogenesis induced by doxorubicin (DOX) to rats by online and off-line LC-MS techniques.It may be used as starting reagent for the preparation of two powerful β2-adrenergic receptor agonists, used for the treatment of asthma: Procaterol and Indacaterol.