Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) requiring high enantiomeric purity. Its protected amine and hydroxyl-like functionality make it suitable for peptide-like coupling reactions and heterocycle formation. Commonly employed in the preparation of protease inhibitors and central nervous system agents due to its ability to mimic natural amino acid structures while enhancing metabolic stability. The bis(tosylate) groups allow for selective deprotection and further functionalization in multi-step syntheses.