Acid Yellow 9

CAS Registry Number®

2706-28-7

CAS Name

Acid Yellow 9

Molecular Formula

C12H11N3O6S2.2Na

Molecular Mass

403.34

Cite this Page

Acid Yellow 9.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?cas_rn=2706-28-7 (retrieved 2025-03-28) (CAS RN: 2706-28-7).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Other Names and Identifiers

InChI

InChI=1S/C12H11N3O6S2.2Na/c13-11-6-3-9(7-12(11)23(19,20)21)15-14-8-1-4-10(5-2-8)22(16,17)18;;/h1-7H,13H2,(H,16,17,18)(H,19,20,21);;

InChIKey

InChIKey=LNQOMOAGXFELSU-UHFFFAOYSA-N

SMILES

N(=NC1=CC=C(S(=O)(=O)O)C=C1)C2=CC(S(=O)(=O)O)=C(N)C=C2.[Na]

Canonical SMILES

[Na].O=S(=O)(O)C1=CC=C(N=NC2=CC=C(N)C(=C2)S(=O)(=O)O)C=C1

Other Names for this Substance

  • Benzenesulfonic acid, 2-amino-5-[2-(4-sulfophenyl)diazenyl]-, sodium salt (1:2)
  • Fast Yellow S
  • C.I. Acid Yellow 9, disodium salt
  • Benzenesulfonic acid, 2-amino-5-[(4-sulfophenyl)azo]-, disodium salt
  • C.I. Acid Yellow 9

View All

Deleted or Replaced CAS Registry Numbers

56449-60-6

CAS INSIGHTSTM
A hexagon honeycomb pattern featuring icons representing Data Fabric Analytics, Antennas, Construction, DNA, and Sustainability Bamboo. Each hexagon contains a distinct symbol related to its theme, arranged in a visually appealing and interconnected design.