C.I. Acid Orange 33
CAS 6507-77-3
1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[2-[4-[1-[4-[2-(4-hydroxyphenyl)diazenyl]phenyl]cyclohexyl]phenyl]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
CAS6507-77-3
PubChem CIDNot recorded
DTXSIDDTXSID9064394
FormulaC34H28N4Na2O8S2
Mol. Weight730.72 g/mol
SMILES[Na+].[Na+].OC1=CC=C(C=C1)N=NC1=CC=C(C=C1)C1(CCCCC1)C1=CC=C(C=C1)N=NC1=C2C(=CC=C1O)C=C(C=C2S([O-])(=O)=O)S([O-])(=O)=O
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
Brief citations
C.I. Acid Orange 33 (CAS 6507-77-3) https://chemicalindependence.com/chemical/6507-77-3/ EPA TSCA Inventory: CAS 6507-77-3. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory