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2H-Naphtho[1,2-d]triazole-5-sulfonic acid, 2-[4-[2-[4-[2-[2-methyl-4-(7-sulfo-2H-naphtho[1,2-d]triazol-2-yl)phenyl]diazenyl]-2-sulfophenyl]ethenyl]-3-sulfophenyl]-, sodium salt (1:4)

CAS 16596-97-7

Molecular structure of 16596-97-7
4 Na⁺
US productionNot reported
Import value, 2024$1.4B
Top sourceIreland 33%

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 293399 · basket

These shares come from HS customs code 293399, which covers 518 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IE 33%IrelandCN 26%ChinaIN 11%IndiaDE 9%GermanyIT 4%Italy

Why It Matters

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

Chemical Identity

CAS16596-97-7
PubChem CIDNot recorded
DTXSIDDTXSID60889656
FormulaC41H24N8Na4O12S4
Mol. Weight1040.89 g/mol
SMILES[Na+].[Na+].[Na+].[Na+].CC1=CC(=CC=C1N=NC1=CC=C(C=CC2=CC=C(C=C2S([O-])(=O)=O)N2N=C3C=C(C4=C(C=CC=C4)C3=N2)S([O-])(=O)=O)C(=C1)S([O-])(=O)=O)N1N=C2C=CC3=C(C=CC(=C3)S([O-])(=O)=O)C2=N1

Data Sources

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Brief citations

2H-Naphtho[1,2-d]triazole-5-sulfonic acid, 2-[4-[2-[4-[2-[2-methyl-4-(7-sulfo-2H-naphtho[1,2-d]triazol-2-yl)phenyl]diazenyl]-2-sulfophenyl]ethenyl]-3-sulfophenyl]-, sodium salt (1:4) (CAS 16596-97-7) https://chemicalindependence.com/chemical/16596-97-7/ EPA TSCA Inventory: CAS 16596-97-7. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293399 for CAS 16596-97-7. Reporting year: 2024. https://usatrade.census.gov/