Used as an internal standard in gas chromatography-mass spectrometry (GC-MS) for accurate quantification and identification of hydrocarbons in complex mixtures. Its deuterated structure provides a distinct mass shift, allowing clear differentiation from non-labeled compounds during analysis. Commonly applied in environmental testing, petroleum research, and metabolomics to improve measurement precision and correct for instrument variability or sample loss. Stable isotopic labeling ensures minimal interference with sample components, making it ideal for trace-level detection and isotopic dilution methods.