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Cuprate(4-), [μ-[[6,6'-[[3,3'-di(hydroxy-κO)[1,1'-biphenyl]-4,4'-diyl]bis[(2,1-diazenediyl-κN1)[4,5-dihydro-3-methyl-5-(oxo-κO)-1H-pyrazole-4,1-diyl]]]bis[1,3-naphthalenedisulfonato]](8-)]]di-, sodium (1:4)

CAS 67952-81-2

Molecular structure of 67952-81-2
4 Na⁺ · 2 Cu²⁺
US productionNot reported
Import value, 2024$597M
Top sourceSwitzerland 53%

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 293319 · basket

These shares come from HS customs code 293319, which covers 133 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CH 53%SwitzerlandDE 22%GermanyIN 14%IndiaCN 4%ChinaIT 3%Italy

Why It Matters

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

Chemical Identity

CAS67952-81-2
PubChem CIDNot recorded
DTXSIDDTXSID401015036
FormulaC40H22Cu2N8Na4O16S4
Mol. Weight1217.95 g/mol
SMILES[Na+].[Na+].[Na+].[Na+].[Cu++].[Cu++].CC1=NN(C(=O)[C-]1\N=N\C1=CC=C(C=C1[O-])C1=CC=C(\N=N\[C-]2C(C)=NN(C2=O)C2=CC3=CC(=CC(=C3C=C2)S([O-])(=O)=O)S([O-])(=O)=O)C([O-])=C1)C1=CC2=CC(=CC(=C2C=C1)S([O-])(=O)=O)S([O-])(=O)=O

Data Sources

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Brief citations

Cuprate(4-), [μ-[[6,6'-[[3,3'-di(hydroxy-κO)[1,1'-biphenyl]-4,4'-diyl]bis[(2,1-diazenediyl-κN1)[4,5-dihydro-3-methyl-5-(oxo-κO)-1H-pyrazole-4,1-diyl]]]bis[1,3-naphthalenedisulfonato]](8-)]]di-, sodium (1:4) (CAS 67952-81-2) https://chemicalindependence.com/chemical/67952-81-2/ EPA TSCA Inventory: CAS 67952-81-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293319 for CAS 67952-81-2. Reporting year: 2024. https://usatrade.census.gov/