Used as a stable isotope-labeled internal standard in mass spectrometry-based lipidomics for accurate quantification of phospholipids. Its deuterated structure allows clear distinction from endogenous lipids, minimizing interference from biological matrices. Commonly applied in studies of membrane lipid metabolism, signal transduction, and biomarker discovery due to its structural similarity to natural phosphatidylglycerols. Also employed in model membrane systems to investigate lipid-protein interactions and membrane dynamics using techniques like NMR and neutron scattering, where the deuterium labels enhance detection sensitivity.