Flag of the United StatesAmerican Chemical Independence

EINECS 240-588-8

CAS 16521-34-9

Cuprate(2-), bis[3-(hydroxy-κO)-4-(2-phenyldiazenyl)-2-naphthalenecarboxylato(2-)-κO]-, hydrogen (1:2)

EPA and Census publish no US supply data for this chemical.

Molecular structure of 16521-34-9
2 H⁺ · 1 Cu²⁺
US productionNot reported
Top sourceNo public record

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

Where It Comes From

EPA and Census publish no US supply data for this chemical.

Why It Matters

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

Chemical Identity

CAS16521-34-9
PubChem CIDNot recorded
DTXSIDDTXSID601015399
FormulaC34H22CuN4O6
Mol. Weight646.118 g/mol
SMILES[H+].[H+].[Cu++].[O-]C(=O)C1=CC2=CC=CC=C2C(\N=N\C2=CC=CC=C2)=C1[O-].[O-]C(=O)C1=CC2=CC=CC=C2C(\N=N\C2=CC=CC=C2)=C1[O-]

Data Sources

← Back to Dashboard

Brief citations

EINECS 240-588-8 (CAS 16521-34-9) https://chemicalindependence.com/chemical/16521-34-9/ EPA TSCA Inventory: CAS 16521-34-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory