Used as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry and chromatography for the accurate quantification of Bisphenol A in environmental, biological, and food samples. Its deuterated form allows differentiation from non-labeled compounds during detection, improving measurement precision and reliability. Commonly applied in studies monitoring endocrine disruptors, where it helps assess exposure levels in urine, blood, and water samples. Also utilized in metabolic studies to track the transformation and elimination of Bisphenol A in organisms without interference from endogenous sources.