N-Phthaloyl-DL-glutamic Anhydride is primarily utilized in organic synthesis as a versatile intermediate for the preparation of various biologically active compounds. It is commonly employed in peptide synthesis, where it serves as a protecting group for amino acids, particularly glutamic acid, to prevent unwanted side reactions during the formation of peptide bonds. Additionally, it is used in the development of pharmaceutical agents, including potential drugs targeting neurological disorders and cancer, due to its ability to modify and stabilize specific molecular structures. Its role in the synthesis of chiral compounds also makes it valuable in producing enantiomerically pure substances for research and industrial applications.