Used as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry and nuclear magnetic resonance (NMR) studies. Enables accurate quantification and tracking of benzophenone and related compounds in environmental, biological, and pharmaceutical samples. Helps distinguish between endogenous compounds and external standards due to its isotopic labeling, improving measurement precision. Also employed in photochemical research to study reaction mechanisms involving benzophenone as a photosensitizer, allowing researchers to trace reaction pathways without altering chemical behavior.