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C.I. Direct green 1

CAS 3626-28-6

2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[2-[4'-[2-(4-hydroxyphenyl)diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-6-(2-phenyldiazenyl)-, sodium salt (1:2)

Molecular structure of 3626-28-6
2 Na⁺
US productionNot reported
Import value, 2024$18M
Top sourceIndia 41%

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 320414 · basket

These shares come from HS customs code 320414, which covers 36 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 41%IndiaMX 33%MexicoJP 8%JapanDE 6%GermanyTW 3%Taiwan

Why It Matters

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

Chemical Identity

CAS3626-28-6
PubChem CIDNot recorded
DTXSIDDTXSID3025201
FormulaC34H23N7Na2O8S2
Mol. Weight767.7 g/mol
SMILES[Na+].[Na+].NC1=C(N=NC2=CC=C(C=C2)C2=CC=C(C=C2)N=NC2=CC=C(O)C=C2)C(=CC2=C1C(O)=C(N=NC1=CC=CC=C1)C(=C2)S([O-])(=O)=O)S([O-])(=O)=O

Data Sources

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Brief citations

C.I. Direct green 1 (CAS 3626-28-6) https://chemicalindependence.com/chemical/3626-28-6/ EPA TSCA Inventory: CAS 3626-28-6. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 320414 for CAS 3626-28-6. Reporting year: 2024. https://usatrade.census.gov/