Cbz-D-2,4-Diaminobutyric acid is primarily used in peptide synthesis as a building block. It serves as a protected amino acid derivative, where the Cbz (carbobenzyloxy) group safeguards the amino functionality during the synthesis process. This compound is particularly valuable in creating peptides with specific structural or functional properties, as it allows for controlled incorporation of the diamino acid into peptide chains. It is also utilized in research for developing peptide-based drugs, biomaterials, and bioactive molecules, where precise amino acid sequences are critical. Additionally, it finds application in studying enzyme-substrate interactions and designing enzyme inhibitors due to its unique structure.