D-2,4-Diaminobutyric acid dihydrochloride is a non-proteinogenic amino acid derivative. Structurally, it is a derivative of butyric acid with amino groups at the 2 and 4 positions, and it exists as the dihydrochloride salt, which enhances its stability and solubility in aqueous solutions. The compound features a D-configuration at the chiral center. This compound serves as a key building block in peptide chemistry and medicinal research. It is primarily used in the synthesis of peptide analogs and peptidomimetics, where its unique structure—containing two amino groups with different reactivities—allows for the introduction of specific functionalities or for creating constrained peptide backbones. It is a crucial precursor for synthesizing polyamines and their conjugates, which are of interest in biochemical studies. As a chiral, bifunctional amine, it is also a valuable intermediate in organic synthesis for constructing more complex molecules. Its applications extend to research areas involving enzyme inhibitors and the study of amino acid transport systems. Handling requires standard precautions for amino acid salts and amines.