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5-amino-4-oxopentanoic acid hydrochloride; CAS No.: 5451-09-2; 5-amino-4-oxopentanoic acid hydrochloride. PROPERTIES: This amino-substituted oxo acid features molecular formula C?H??ClNO? with molecular weight 167.59 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 amide 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 an oxo acid derivative, 5-amino-4-oxopentanoic acid hydrochloride is used in peptide synthesis. It serves as key intermediate in constructing peptide-based fluorescent probes, where the amino group forms amide bonds with fluorophores. Also used in materials science as monomer for preparing polyamide membranes with enhanced gas separation properties.