Used in peptide synthesis as a protected form of aspartic acid, enabling the construction of complex peptides without unwanted side reactions. It serves as a building block in the production of bioactive peptides and pharmaceuticals. The methyl ester group provides stability during synthesis, allowing selective deprotection when needed. Its application is crucial in research and development of peptide-based drugs, particularly in cancer therapy and enzyme inhibitors. Additionally, it aids in studying peptide structure and function in biochemical research.