Acid Orange 56
CAS 6470-20-8
[1,1'-Biphenyl]-2,2'-disulfonic acid, 4-[2-(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)diazenyl]-4'-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-, sodium salt (1:2)
EPA and Census publish no US supply data for this chemical.
US productionNot reported
Top sourceNo public record
This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.
Why supply is unknownWhere It Comes From
EPA and Census publish no US supply data for this chemical.
Why It Matters
No EPA sector or FDA product records name a use for this chemical.
Chemical Identity
CAS6470-20-8
PubChem CIDNot recorded
DTXSIDDTXSID80889552
FormulaC32H22N6Na2O8S2
Mol. Weight728.66 g/mol
SMILES[Na+].[Na+].CC1=NN(C(=O)C1N=NC1=CC=C(C2=CC=C(C=C2S([O-])(=O)=O)N=NC2=C3C=CC=CC3=CC=C2O)C(=C1)S([O-])(=O)=O)C1=CC=CC=C1
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
Brief citations
Acid Orange 56 (CAS 6470-20-8) https://chemicalindependence.com/chemical/6470-20-8/ EPA TSCA Inventory: CAS 6470-20-8. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory