O-Benzyl-D-serine is primarily used in the synthesis of peptides and pharmaceutical compounds. It serves as a chiral building block in the production of biologically active molecules, particularly in the development of drugs targeting neurological disorders and cancer. Its benzyl group provides protection during peptide synthesis, ensuring selective reactions. Additionally, it is utilized in research to study enzyme mechanisms and protein interactions due to its specific stereochemistry. Its applications extend to the preparation of modified amino acids for use in drug discovery and medicinal chemistry.