1,2,4-Trihydroxyanthraquinone

1,2,4-Trihydroxyanthraquinone
Names
	Preferred IUPAC name 1,2,4-Trihydroxyanthracene-9,10-dione
	Other names Purpurin, Purpurine, Hydroxylizaric acid
Identifiers
CAS Number	81-54-9 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:8645 ;
ChEMBL	ChEMBL294264 ;
ChemSpider	6431 ;
ECHA InfoCard	100.001.237
KEGG	C10395 ;
PubChem CID	6683;
UNII	L1GT81LS6N ;
CompTox Dashboard (EPA)	DTXSID4021214 ;
	InChI InChI=1S/C14H8O5/c15-8-5-9(16)14(19)11-10(8)12(17)6-3-1-2-4-7(6)13(11)18/h1-5,15-16,19H Key: BBNQQADTFFCFGB-UHFFFAOYSA-N ; InChI=1/C14H8O5/c15-8-5-9(16)14(19)11-10(8)12(17)6-3-1-2-4-7(6)13(11)18/h1-5,15-16,19H Key: BBNQQADTFFCFGB-UHFFFAOYAW;
	SMILES C1=CC=C2C(=C1)C(=O)C3=C(C2=O)C(=C(C=C3O)O)O; O=C2c1ccccc1C(=O)c3c2c(O)cc(O)c3O;
Properties
Chemical formula	C14H8O5
Molar mass	256.21 g/mol
Melting point	259 °C (498 °F; 532 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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.

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.