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2,4-diaminobutyric acid dihydrochloride; CAS No.: 65427-54-5; 2,4-diaminobutyric acid dihydrochloride. PROPERTIES: This diamino-substituted butyric acid features molecular formula C?H??Cl?N?O? with molecular weight 209.07 g/mol. Exists as a crystalline solid. Soluble in polar protic solvents like methanol and water. Melting point approximately 120-125 C. Exhibits IR absorption for carboxylic acid and amine groups. Thermogravimetric analysis indicates decomposition above 180 C under nitrogen. Store at 2-8 C in sealed containers. May cause skin irritation and eye damage. APPLICATIONS: As a diamino acid, 2,4-diaminobutyric acid dihydrochloride is used in peptide synthesis. It serves as key intermediate in constructing peptide-based fluorescent probes, where the amino groups form amide bonds with fluorophores. Also used in materials science as monomer for preparing polyamide membranes with enhanced gas separation properties.