Used as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry and chromatography for quantifying benzophenone derivatives in complex matrices. Its deuterated structure allows for accurate differentiation from non-labeled compounds, enhancing measurement precision in environmental, pharmaceutical, and biological samples. Commonly applied in studies involving UV filter metabolites, where 3-acetylbenzophenone is a degradation product. The compound supports high-sensitivity detection and improves reliability in pharmacokinetic and metabolic profiling workflows.