:D&C Red 33

{{chembox

| ImageFile=Red 33.png

| IUPACName=Disodium 5-amino-4-hydroxy-3-(phenylazo)-naphthalene-2,7-disulfonate

| OtherNames=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

|Section1={{Chembox Identifiers

| CASNo=3567-66-6

| EINECS=

| PubChem=9570136

| ChemSpiderID = 10660796

| 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+;;

| InChIKey = LQJVOKWHGUAUHK-GJLVVKPQBK

| StdInChI = 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+;;

| StdInChIKey = LQJVOKWHGUAUHK-BUFQOAPZSA-L

| 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+]

}}

|Section2={{Chembox Properties

| C=16 | H=11 | N=3 | O=7 | S=2 | Na=2

| Appearance=Dark reddish brown powder

| Density=

| MeltingPt= decomposes below the melting point

| BoilingPt=

| Solubility=

}}

|Section3={{Chembox Hazards

| MainHazards=

| FlashPt=

| AutoignitionPt =

}}

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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.{{CPID|id=1026|name=FD&C Red #33}} 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.{{cite journal|title=Purification of D&C Red. No. 33 by preparative high-performance liquid chromatography|journal=Journal of Chromatography A|volume=314|pages=379–385|doi=10.1016/S0021-9673(01)97750-7|year=1984|last1=Bailey|first1=John E|pmid=6526888}}