Used in the synthesis of protease inhibitors, particularly in the development of antiviral drugs. It serves as a chiral building block for constructing complex molecules that target viral enzymes, such as those in hepatitis C and other RNA viruses. Its stereochemistry and functional groups allow for precise interactions with enzyme active sites, enhancing drug potency and selectivity. Commonly employed in medicinal chemistry for structure-activity relationship studies and optimization of pharmacokinetic properties in drug candidates.