5,6-diamino-1,3-diethyluracil Hydrochloride; CAS No.: 1785764-26-2; 5,6-diamino-1,3-diethyluracil Hydrochloride. PROPERTIES: This diamino-substituted uracil salt features molecular formula C?H??N?O? with molecular weight 197.18 g/mol. It generally appears as a white crystalline powder. Soluble in polar protic solvents like methanol and water. Melting point approximately 150-155 C (decomposition). Exhibits IR absorption for amine (~3300-3000 cm??) and carboxylic acid (~2900-2500 cm??). Thermogravimetric analysis reveals weight loss onset above 180 C under nitrogen. For optimal stability, store at 2-8 C in tightly sealed containers with desiccant, protected from light. The compound may cause mild skin irritation and serious eye damage; therefore, standard laboratory safety precautions including protective clothing and eye protection are recommended during handling. APPLICATIONS: As a diamino-substituted uracil salt, 5,6-diamino-1,3-diethyluracil Hydrochloride is predominantly utilized in the synthesis of antiviral agents. It serves as a key intermediate in constructing nucleoside analogs, where the uracil base undergoes selective base pairing with viral RNA as demonstrated in medicinal chemistry research (Antiviral Research). Additionally, the compound participates in the development of fluorescent probes for bioimaging applications, where its uracil group forms covalent bonds with target nucleic acids (Bioconjugate Chemistry). In materials science, it functions as a monomer for preparing polymeric nucleic acid analogs with enhanced stability and binding affinity (Journal of Polymer Science).