4-Mercapto-4-methylpentanoic acid is primarily used in the synthesis of various organic compounds, particularly in the production of pharmaceuticals and agrochemicals. Its thiol group makes it a valuable building block for creating molecules with specific biological activities. In the pharmaceutical industry, it is often employed in the development of drugs targeting metabolic disorders and inflammatory conditions. Additionally, it serves as a key intermediate in the manufacture of herbicides and fungicides, contributing to crop protection and agricultural productivity. Its unique structure also allows it to act as a ligand in coordination chemistry, facilitating the creation of metal complexes used in catalysis and material science.