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C.I. Pigment Red 41

CAS 6505-29-9

3H-Pyrazol-3-one, 4,4'-[(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(2,1-diazenediyl)]bis[2,4-dihydro-5-methyl-2-phenyl-

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

Molecular structure of 6505-29-9
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

CAS6505-29-9
PubChem CIDNot recorded
DTXSIDDTXSID50884317
FormulaC34H30N8O4
Mol. Weight614.666 g/mol
SMILESCOC1=CC(=CC=C1N=NC1C(C)=NN(C1=O)C1=CC=CC=C1)C1=CC=C(N=NC2C(C)=NN(C2=O)C2=CC=CC=C2)C(OC)=C1

Data Sources

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Brief citations

C.I. Pigment Red 41 (CAS 6505-29-9) https://chemicalindependence.com/chemical/6505-29-9/ EPA TSCA Inventory: CAS 6505-29-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory