CAS 2706-28-7PubChem CID 75918
Benzenesulfonic acid, 2-amino-5-(2-(4-sulfophenyl)diazenyl)-, sodium salt (1:?)
Fast yellow is an organic sodium salt that is 4-aminoazobenzene-3,4'-disulfonic acid in which the protons of both of the sulfo groups have been replaced by sodium ions. It is used as a biological stain. It was formerly used as a food coloring agent (E105), but its use in food or drinks is now forbidden. It has a role as a histological dye. It contains a 4-aminoazobenzene-3,4'-disulfonate. — ChEBI
- IUPAC name
- disodium;2-amino-5-[(4-sulfonatophenyl)diazenyl]benzenesulfonate
- Molecular formula
- C12H9N3Na2O6S2
- Molecular weight
- 401.3 g/mol
- Exact mass
- 400.97281593 Da
- Topological polar surface area
- 182.0 Ų
- Hydrogen-bond donors
- 1
- Hydrogen-bond acceptors
- 9
- Covalent units
- 3
- Defined stereocentres
- 0
Also known as
RefChem:1078712Fast Yellow ABYellow acidAcid yellow 9C.I. Acid Yellow 9Yellow FastCilefa Yellow RFast Yellow S
16 more reported names
Fast Yellow YAcid Yellow ATLacquer Yellow TAmacid Yellow RGAcid Yellow GeigyFast Yellow ExtraGolden Yellow RuafKiton Yellow ExtraAcilan Yellow ExtraHexacol Acid Yellow GC.I. Food Yellow 2Food Yellow 2Acetyl Yellow G4-Aminoazobenzene-3,4'-disulfonic acid disodium saltAcid Yellow GC.I. 13015
External database identifiers
- ChEBI:CHEBI:86126
- EPA DTXSID:DTXSID00889458
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.