Quinophthalone
CAS 83-08-9
1H-Indene-1,3(2H)-dione, 2-(2-quinolinyl)-
EPA and Census publish no US supply data for this chemical.
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 unknownWhere 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.
Vendor Pricing
$0.37/gAaron Chemicals LLC
CountryHong Kong
Pack$183.00 / 500 g
Purity99%
Vendors18 available
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
17 more vendors
| Vendor | Country Supplier country. Where available, shows shipping origin. When the supplier ships from a different country than where they are registered, both are shown. Most suppliers show registration country only. | $/g | Pack | Purity |
|---|---|---|---|---|
| Angene Chemical | China → Hong Kong | $0.39 | 500 g | 99% |
| A2B Chem LLC | United States | $0.59 | 500 g | — |
| AstaTech (2 weeks) | United States | $0.70 | 500 g | 95% |
| AA BLOCKS | United States | $0.77 | 500 g | — |
| Sigma-Aldrich (Rush Stock) | Germany | $3.24 | 25 g | — |
| Sigma-Aldrich | Germany | $3.24 | 25 g | — |
| AK Scientific Specialized | United States | $3.60 | 25 g | 95% |
| AK Scientific, Inc. | United States | $51.00 | 5 g | 97% |
| Interbioscreen | Hong Kong | $102.00 | 10 g | 95% |
| Labotest KG | Germany | $453.00 | 1000 mg | 90% |
| Angene International Limited | United States | $2610.00 | 100 mg | 99% |
| Otava, Ltd. (2 weeks) | Ukraine | $2724.00 | 50 mg | 90% |
| Princeton BioMolecular Research (SC) | United States | $2900.00 | 100 mg | 90% |
| Vitas M Chemical Limited | Hong Kong | $3170.00 | 100 mg | 90% |
| ChemDiv, Inc. | United States | $4070.00 | 100 mg | 90% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 99% |
| TimTec, LLC (back-ordered) | United States | $32000.00 | 15 mg | 94% |
Chemical Identity
CAS83-08-9
PubChem CIDNot recorded
DTXSIDDTXSID00873130
FormulaC18H11NO2
Mol. Weight273.291 g/mol
SMILESO=C1C(C(=O)C2=CC=CC=C12)C1=NC2=C(C=CC=C2)C=C1
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
Brief citations
Quinophthalone (CAS 83-08-9) https://chemicalindependence.com/chemical/83-08-9/ EPA TSCA Inventory: CAS 83-08-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory