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C.I. Acid Orange 156

CAS 68555-86-2

Benzenesulfonic acid, 4-[2-[5-methoxy-4-[2-(4-methoxyphenyl)diazenyl]-2-methylphenyl]diazenyl]-, sodium salt (1:1)

EPA and Census publish no US supply data for this chemical.

Molecular structure of 68555-86-2
1 Na⁺
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 unknown

Where 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

CAS68555-86-2
PubChem CIDNot recorded
DTXSIDDTXSID7044718
FormulaC21H19N4NaO5S
Mol. Weight462.46 g/mol
SMILES[Na+].COC1=CC=C(C=C1)N=NC1=C(OC)C=C(N=NC2=CC=C(C=C2)S([O-])(=O)=O)C(C)=C1

Data Sources

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Brief citations

C.I. Acid Orange 156 (CAS 68555-86-2) https://chemicalindependence.com/chemical/68555-86-2/ EPA TSCA Inventory: CAS 68555-86-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory