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D&C Red 33
Names
	IUPAC name Disodium 5-amino-4-hydroxy-3-(phenylazo)-naphthalene-2,7-disulfonate
	Other names D&C Red 33, Acid Red 33, Azo grenadine, Azo fuchsine, Acid fuchsine D, Redusol Z, Azo magenta G, Certicol Red B, Fast acid magenta, Hexalan Red B, Acetyl Red B, Naphthalene Red B, C.I. 17200
Identifiers
CAS Number	3567-66-6;
3D model (JSmol)	Interactive image;
ChemSpider	10660796;
ECHA InfoCard	100.020.597
PubChem CID	9570136;
CompTox Dashboard (EPA)	DTXSID1044562 ;
	InChI InChI=1S/C16H13N3O7S2.2Na/c17-12-8-11(27(21,22)23)6-9-7-13(28(24,25)26)15(16(20)14(9)12)19-18-10-4-2-1-3-5-10;;/h1-8,20H,17H2,(H,21,22,23)(H,24,25,26);;/q;2+1/p-2/b19-18+;; Key: LQJVOKWHGUAUHK-BUFQOAPZSA-L; InChI=1/C16H13N3O7S2.2Na/c17-12-8-11(27(21,22)23)6-9-7-13(28(24,25)26)15(16(20)14(9)12)19-18-10-4-2-1-3-5-10;;/h1-8,20H,17H2,(H,21,22,23)(H,24,25,26);;/q;2+1/p-2/b19-18+;; Key: LQJVOKWHGUAUHK-GJLVVKPQBK;
	SMILES OC1=C(C(N)=CC(S([O-])(=O)=O)=C3)C3=CC(S([O-])(=O)=O)=C1\N=N\C2=CC=CC=C2.[Na+].[Na+];
Properties
Chemical formula	C16H11N3Na2O7S2
Molar mass	467.38 g·mol−1
Appearance	Dark reddish brown powder
Melting point	decomposes below the melting point
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

D&C Red 33 also known as Acid Red 33 or simply Red 33 is a red azo dye used as a colorant in mouthwashes, dentifrices, cosmetics, and hair dyes.^[1] Red 33 is a disodium salt of 5-amino-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonic acid, which can be purified through high performance liquid chromatography.^[2]

References

^ FD&C Red #33 in the Consumer Product Information Database
^ Bailey, John E (1984). "Purification of D&C Red. No. 33 by preparative high-performance liquid chromatography". Journal of Chromatography A. 314: 379–385. doi:10.1016/S0021-9673(01)97750-7. PMID 6526888.