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C.I. Acid Black 234

CAS 157577-99-6

2,7-Naphthalenedisulfonic acid, 4-amino-3-[2-[4-[[[4-[2-(2,4-diaminophenyl)diazenyl]phenyl]sulfonyl]amino]phenyl]diazenyl]-5-hydroxy-6-(2-phenyldiazenyl)-, sodium salt (1:2)

Molecular structure of 157577-99-6
2 Na⁺
US productionNot reported
Import value, 2024$56M
Top sourceIndia 70%

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 320412 · basket

These shares come from HS customs code 320412, which covers 106 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 70%IndiaMY 7%MalaysiaCH 4%SwitzerlandCN 4%ChinaDE 3%Germany

Why It Matters

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

Chemical Identity

CAS157577-99-6
PubChem CIDNot recorded
DTXSIDDTXSID90890472
FormulaC34H26N10Na2O9S3
Mol. Weight860.8 g/mol
SMILES[Na+].[Na+].NC1=CC=C(N=NC2=CC=C(C=C2)S(=O)(=O)NC2=CC=C(C=C2)N=NC2=C(C=C3C=C(C(N=NC4=CC=CC=C4)=C(O)C3=C2N)S([O-])(=O)=O)S([O-])(=O)=O)C(N)=C1

Data Sources

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Brief citations

C.I. Acid Black 234 (CAS 157577-99-6) https://chemicalindependence.com/chemical/157577-99-6/ EPA TSCA Inventory: CAS 157577-99-6. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 320412 for CAS 157577-99-6. Reporting year: 2024. https://usatrade.census.gov/