Chrome Azurol S

Chrome Azurol S is a histological dye used in biomedical research.^[1][2]

Chrome Azurol S

Names
Preferred IUPAC name Trisodium 5-[(E)-(3-carboxy-5-methyl-4-oxocyclohexa-2,5-dien-1-ylidene)(2,6-dichloro-3-sulfonatophenyl)methyl]-3-methyl-2-oxidobenzoate
Other names Mordant Blue 29 C.I. 43825 Alberon
Identifiers
CAS Number	1667-99-8 N
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL377545
ChemSpider	21159525
ECHA InfoCard	100.015.262
EC Number	216-787-0
PubChem CID	54694372
UNII	Y6C592EY5D Y
CompTox Dashboard (EPA)	DTXSID50889367
InChI InChI=1S/C23H16Cl2O9S.3Na/c1-9-5-11(7-13(20(9)26)22(28)29)17(12-6-10(2)21(27)14(8-12)23(30)31)18-15(24)3-4-16(19(18)25)35(32,33)34;;;/h3-8,26H,1-2H3,(H,28,29)(H,30,31)(H,32,33,34);;;/q;3*+1/p-3/b17-12+;;; Key: FUIZKNBTOOKONL-DPSBJRLESA-K
SMILES CC1=CC(=CC(=C1[O-])C(=O)[O-])C(=C2C=C(C(=O)C(=C2)C(=O)O)C)C3=C(C=CC(=C3Cl)S(=O)(=O)[O-])Cl.[Na+].[Na+].[Na+]
Properties
Chemical formula	C23H13Cl2Na3O9S
Molar mass	605.28 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chrome Azural S (CAS) is a common spectrophotometric reagent for detection of certain metals like aluminum which can be toxic in excess and can contribute to people with neurodegenerative disorders.^[3] CAS is used to provide quantitative and qualitative information on molecules of interest like aluminum and siderophores.^[4] Qualitatively a color change can be observed while also allowing to quantitatively determine concentration of certain ions.