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5-bromo-4(3H)-pyrimidinone hemisulfate; CAS No.: 97234-97-4; 5-bromo-4(3H)-pyrimidinone hemisulfate. PROPERTIES: 5-bromo-4(3H)-pyrimidinone hemisulfate features molecular formula C4H3BrN2O {0.5H2SO4 with molecular weight approximately 230.05 g/mol. It generally appears as a white crystalline powder with a reported melting point of 220-223 C. The compound is moderately hygroscopic and should be stored in a tightly sealed container at room temperature with a desiccant. Safety precautions include using personal protective equipment during handling to prevent skin and eye contact, as it may cause irritation. The hemisulfate salt form improves water solubility compared to the parent compound. In case of accidental release, absorb with inert material and dispose of properly. APPLICATIONS: 5-bromo-4(3H)-pyrimidinone hemisulfate functions as a building block for antiviral agents. Its bromine substituent provides valuable reactivity for further chemical modification. In pharmaceutical development, it has been utilized to create novel antiviral compounds targeting viral reverse transcriptase, as reported in medicinal chemistry journals specializing in virology. The pyrimidinone structure enables hydrogen bonding interactions critical for biological activity. Additionally, this compound serves as a precursor for chemical sensors, with applications described in analytical chemistry literature focusing on fluorescent probes for nucleic acid detection.