Used in research as a labeled intermediate in metabolic studies, particularly in nucleic acid and nucleoside analog pathways. Its deuterated (d3) form allows for tracking via mass spectrometry or NMR, making it valuable in drug metabolism and pharmacokinetic studies. Commonly employed in the development of antiviral or anticancer agents where uracil derivatives play a key role. Also utilized in isotopic labeling experiments to understand biochemical transformations in enzymatic systems.