Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) where stereochemistry plays a critical role in biological activity. Its structure contains both amine and halogen functionalities, making it suitable for coupling reactions in drug design. Commonly employed in the production of central nervous system agents and receptor modulators due to its ability to influence selectivity and binding affinity. The (S)-enantiomer is often preferred for its enhanced pharmacokinetic profile in target molecules.