(S)-4-(1-Aminoethyl)benzoic acid hydrochloride is primarily used in the pharmaceutical industry as a chiral building block for the synthesis of various active pharmaceutical ingredients (APIs). Its chiral nature makes it valuable in the production of enantiomerically pure compounds, which are crucial for drugs that require high stereochemical specificity. This compound is often employed in the development of cardiovascular and central nervous system (CNS) drugs, where precise stereochemistry is essential for efficacy and safety. Additionally, it serves as an intermediate in the synthesis of complex organic molecules, contributing to the advancement of medicinal chemistry and drug discovery.