Used as a stable isotope-labeled internal standard in mass spectrometry-based bioanalytical assays for quantifying lipid metabolites. Its deuterated structure allows for accurate differentiation from endogenous compounds in biological matrices, improving measurement precision. Commonly applied in pharmacokinetic and metabolic studies involving glycerolipids and chlorinated fatty acid derivatives. Also utilized in tracing metabolic pathways due to its resistance to enzymatic degradation, enabling long-term tracking in cellular systems.