Used primarily as a reference standard or metabolite in pharmaceutical research and quality control testing. It helps in studying the metabolic pathways of clarithromycin in the human body, particularly in identifying and quantifying metabolites in biological samples such as plasma, urine, or serum. Commonly employed in HPLC and LC-MS/MS method development for drug monitoring and pharmacokinetic studies. Also useful in assessing drug stability and degradation products during formulation analysis.