Used in biochemical research as a key intermediate in the synthesis of phosphatidylethanolamine, a major phospholipid component of cell membranes. Serves as a substrate in enzyme assays involving phosphoethanolamine cytidylyltransferase and other enzymes in the Kennedy pathway. Also utilized in studies of lipid metabolism and membrane biogenesis in cellular models. Its disodium salt form enhances solubility and stability in aqueous reaction systems.