Dihydroxyanthraquinone

[(Science: chemistry) a colouring principle, C14H6O2(OH)2, found in madder, and now produced artificially from anthracene. It produces the Turkish reds. Origin: f. Alizarine, fr. alizari.

[1. a red dye that occurs in the root of madder (Rubia tinctorum and other Rubiaceae) in glucose combination (ruberythric acid) as orange needles, slightly soluble in water; used by the ancients as a dye. Now produced synthetically from anthracene and used in the manufacture of dyes, alizarin blue, alizarin orange, Turkey red. As an indicator, it is yellow below pH 5.5 and red above pH 6.8; other modified alizarins have other colors and change color at other pH values.

Molecular Formula: C₁₄H₈O₄

InChI: InChI=1/C14H8O4/c15-10-6-5-9-11(14(10)18)13(17)8-4-2-1-3-7(8)12(9)16/h1-6,15,18H

InChIKey: InChIKey=RGCKGOZRHPZPFP-UHFFFAOYAG
SMILES: Oc1ccc2C(=O)c3ccccc3C(=O)c2c1O

CAS number 72-48-0

Names:
    Alizarin
    alizarin
    Alizarin
    alizarin
    Dihydroxyanthraquinone
    Dihydroxy-9,10-anthracenedione
    KBio2_006002
    1,2-dihydroxyanthracene-9,10-dione
    1,2-Dihydroxyanthraquinone
    1,2-dihydroxyanthra-9,10-quinone

Registries:
    PubChem CID 6293
    Beilstein =1914037
    CAS 72-48-0 (from NIST)
    ChEBI 16866
    Gmelin 34541
    Kegg C01474
    PubChem ID 11368404
    PubChem ID 4647