Used as a key intermediate in the synthesis of cephalosporin antibiotics, particularly third-generation cephalosporins. Its structure allows for side-chain modifications that enhance antimicrobial activity and resistance to beta-lactamase enzymes. Commonly employed in pharmaceutical manufacturing to produce broad-spectrum antibiotics effective against Gram-negative bacteria. The hydrochloride salt form improves stability and solubility during synthesis. Widely utilized in semi-synthetic antibiotic development due to its reactive chloromethyl group, enabling further chemical derivatization.