(S)-2-((Methoxycarbonyl)amino)-3-methylbutanoic acid is primarily used in the field of organic synthesis and pharmaceutical research. It serves as a key intermediate in the production of various biologically active compounds, particularly in the synthesis of peptides and modified amino acids. Its chiral structure makes it valuable for designing enantiomerically pure drugs, which are crucial for ensuring specific biological activity and reducing side effects. Additionally, it is utilized in the development of protease inhibitors and other therapeutic agents targeting metabolic disorders. Its role in medicinal chemistry highlights its importance in creating innovative treatments for complex diseases.