6-Carboxyfluorescein
CAS 3301-79-9
Spiro[isobenzofuran-1(3H),9'-[9H]xanthene]-6-carboxylic acid, 3',6'-dihydroxy-3-oxo-
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
$26.64/gA2B Chem LLC
CountryUnited States
Pack$666.00 / 25 g
Purity98%
Vendors24 available
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
23 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 |
|---|---|---|---|---|
| AA BLOCKS | United States | $31.00 | 25 g | 98% |
| Aaron Chemicals LLC | Hong Kong | $33.16 | 25 g | 95% |
| Angene Chemical | China → Hong Kong | $33.40 | 25 g | 95% |
| Chemscene | United States | $38.04 | 25 g | — |
| Combi-Blocks, Inc. | United States | $39.20 | 25 g | 96% |
| BLD Pharmatech Co., Limited | United States | $39.20 | 25 g | 98% |
| BLD Pharmatech GmbH | Germany | $39.20 | 25 g | 98% |
| BLD Pharmatech Ltd. | China | $39.20 | 25 g | 98% |
| Ambeed, Inc. | United States | $39.20 | 25 g | 98% |
| AstaTech, Inc | United States | $58.40 | 5 g | 95% |
| Fluorochem EU | Germany | $63.16 | 5 g | 95% |
| Fluorochem UK | United Kingdom | $77.22 | 1 g | 95% |
| Angene International Limited | United States | $77.80 | 5 g | 97% |
| Accela ChemBio | United States | $93.00 | 1 g | 97% |
| AK Scientific, Inc. | United States | $124.00 | 1 g | 98% |
| Apexbio Technology LLC | United States | $314.00 | 500 mg | 98.76% |
| TargetMol Chemicals | China → United States | $394.00 | 500 mg | 98.73% |
| MedChemExpress MCE | Sweden | $626.78 | 500 mg | 99.88% |
| TargetMol Chemicals EU | Austria | $760.00 | 100 mg | 98.73% |
| Cayman Europe | Estonia | $1235.22 | 1 g | 98% |
| Angene | China → Hong Kong | $2500.00 | 30 mg | 95% |
| Sigma-Aldrich (Rush Stock) | Germany | $4011.00 | 50 mg | 97% |
| Sigma-Aldrich | Germany | $4011.00 | 50 mg | 97% |
Chemical Identity
CAS3301-79-9
PubChem CIDNot recorded
DTXSIDDTXSID6062965
FormulaC21H12O7
Mol. Weight376.32 g/mol
SMILESOC(=O)C1=CC=C2C(=O)OC3(C2=C1)C1=CC=C(O)C=C1OC1=CC(O)=CC=C31
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
Brief citations
6-Carboxyfluorescein (CAS 3301-79-9) https://chemicalindependence.com/chemical/3301-79-9/ EPA TSCA Inventory: CAS 3301-79-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory