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CAS No.: 25465-77-4; Purpurin 18. PROPERTIES: Purpurin 18 is a red crystalline solid with a molecular weight of 298.2 g/mol. Its chemical formula is C16H8O5. The compound is sparingly soluble in organic solvents and requires warming for complete dissolution. It should be stored at room temperature in airtight containers protected from light. Stability is maintained for several years under proper conditions. Safety considerations include avoiding skin contact and using standard laboratory PPE. The substance is irritating to eyes and skin but is not classified as harmful. APPLICATIONS: Purpurin 18 is a natural anthraquinone derivative originally isolated from madder roots. It has been investigated for its potential anticancer properties, particularly in photodynamic therapy applications. Upon light activation, Purpurin 18 generates reactive oxygen species that induce cancer cell death. The compound has also been explored in the development of novel antimicrobial agents. Additionally, Purpurin 18 serves as a starting material in the synthesis of more complex organic molecules with therapeutic potential. These applications are documented in natural products chemistry literature and specialized research publications on photodynamic therapy and antimicrobial agents.