(S)-Methyl indoline-2-carboxylate hydrochloride is primarily used in pharmaceutical research and development as a key intermediate in the synthesis of biologically active compounds. It plays a significant role in the production of chiral molecules, particularly in the creation of drugs targeting the central nervous system. Its stereospecific structure makes it valuable for designing enantiomerically pure compounds, which are crucial for achieving higher efficacy and reduced side effects in therapeutic agents. Additionally, it is utilized in the study of enzyme inhibitors and receptor modulators, contributing to advancements in medicinal chemistry.