Used primarily as an analytical reference standard in pharmaceutical research and quality control. It serves as a metabolite reference for chlorphenamine, aiding in the study of metabolic pathways and drug interactions. Commonly employed in bioanalytical assays such as HPLC and mass spectrometry to detect and quantify chlorphenamine and its oxidative metabolites in biological samples. Also utilized in the development and validation of analytical methods for antihistamine detection in forensic and clinical toxicology.