Allura Red AC

Allura Red AC
Names
	Preferred IUPAC name Disodium 7-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
	Other names Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonate; Allura Red; Food Red 17; C.I. 16035; FD&C Red 40; E140; 2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-, disodium salt;
Identifiers
CAS Number	25956-17-6 ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL174821 ;
ChemSpider	11588224 ;
ECHA InfoCard	100.043.047
E number	E129 (colours)
PubChem CID	6093299;
UNII	WZB9127XOA ;
CompTox Dashboard (EPA)	DTXSID4024436 ;
	InChI InChI=1S/C18H16N2O8S2.2Na/c1-10-7-14(16(28-2)9-17(10)30(25,26)27)19-20-18-13-5-4-12(29(22,23)24)8-11(13)3-6-15(18)21;;/h3-9,21H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2+1/p-2/b20-19+;; Key: CEZCCHQBSQPRMU-LLIZZRELSA-L ; InChI=1/C18H16N2O8S2.2Na/c1-10-7-14(16(28-2)9-17(10)30(25,26)27)19-20-18-13-5-4-12(29(22,23)24)8-11(13)3-6-15(18)21;;/h3-9,21H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2+1/p-2/b20-19+;; Key: CEZCCHQBSQPRMU-JGGVBICHBN;
	SMILES [Na+].[Na+].COc3cc(c(C)cc3/N=N/c1c2ccc(cc2ccc1O)S([O-])(=O)=O)S([O-])(=O)=O;
Properties
Chemical formula	C18H14N2Na2O8S2
Molar mass	496.42 g·mol−1
Appearance	Red powder
Melting point	> 300 °C (572 °F; 573 K)
Hazards
NFPA 704 (fire diamond)	1 1 0
	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

Allura Red AC is a red azo dye that goes by several names, including FD&C Red 40. It is used as a food dye and has the E number E129.

It is usually supplied as its red sodium salt, but can also be used as the calcium and potassium salts. These salts are soluble in water. In solution, its maximum absorbance lies at about 504 nm.^: 921

Allura Red, FD&C Red No. 40 is manufactured by coupling diazotized 5-amino-4-methoxy-2-toluenesulfonic acid with 6-hydroxy-2-naphthalene sulfonic acid in an azo coupling reaction.

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