1,2,4-Trihydroxyanthraquinone
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1,2,4-Trihydroxyanthraquinone, commonly called purpurin, is an anthraquinone. It is a naturally occurring red/yellow dye. It is formally derived from 9,10-anthraquinone by replacement of three hydrogen atoms by hydroxyl (OH) groups.
Quick Facts Names, Identifiers ...
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Preferred IUPAC name
1,2,4-Trihydroxyanthracene-9,10-dione | |
Other names
Purpurin, Purpurine, Hydroxylizaric acid | |
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ChEBI | |
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ChemSpider |
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ECHA InfoCard | 100.001.237 |
KEGG |
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PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C14H8O5 | |
Molar mass | 256.21 g/mol |
Melting point | 259 °C (498 °F; 532 K)[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Purpurin is also called verantin, smoke Brown G, hydroxylizaric acid, and C.I. 58205. It is a minor component of the classical lake pigment "madder lake" or Rose Madder.