Used as a stable isotope-labeled internal standard in mass spectrometry-based lipidomics for accurate quantification of phosphatidylethanolamines in biological samples. Its deuterated palmitoyl chain provides distinct mass separation, enabling precise detection and measurement even in complex lipid mixtures. Commonly applied in studies of cell membrane dynamics, metabolic pathways, and disease biomarker discovery where reliable lipid profiling is essential. Also utilized in model membrane systems to investigate lipid-protein interactions and membrane fluidity with minimized interference from natural isotopic overlap.