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Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-[2-(4-hydroxyphenyl)diazenyl]-, sodium salt (1:2)

CAS 3051-11-4

Molecular structure of 3051-11-4
2 Na⁺
US productionNot reported
Import value, 2024$50M
Top sourceIndonesia 23%

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

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 292700 · basket

These shares come from HS customs code 292700, which covers 89 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
ID 23%IndonesiaJP 18%JapanMX 16%MexicoCN 13%ChinaKR 8%South Korea

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS3051-11-4
PubChem CIDNot recorded
DTXSIDDTXSID8062814
FormulaC26H18N4Na2O8S2
Mol. Weight624.55 g/mol
SMILES[Na+].[Na+].OC1=CC=C(C=C1)N=NC1=CC(=C(C=CC2=C(C=C(C=C2)N=NC2=CC=C(O)C=C2)S([O-])(=O)=O)C=C1)S([O-])(=O)=O

Data Sources

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Brief citations

Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-[2-(4-hydroxyphenyl)diazenyl]-, sodium salt (1:2) (CAS 3051-11-4) https://chemicalindependence.com/chemical/3051-11-4/ EPA TSCA Inventory: CAS 3051-11-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 292700 for CAS 3051-11-4. Reporting year: 2024. https://usatrade.census.gov/