Used as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry and chromatography, to accurately quantify trace levels of bisphenol A in environmental, biological, and food samples. Its deuterated structure allows for differentiation from non-labeled compounds, improving measurement precision and reliability. Commonly applied in studies monitoring endocrine disruptors, assessing human exposure, and evaluating contamination in water, urine, and consumer products.