4H-1-Benzopyran-4-one, 2,3-dihydro-
CAS 491-37-2
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 unknownProduction 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 293299 · basket
These shares come from HS customs code 293299, which covers 229 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- United Kingdom
- Japan
- Germany
- Spain
- Israel
- Canada
- Brazil
- Vietnam
- Ukraine
- New Zealand
- Belgium
- Mexico
- Singapore
- Taiwan
- South Korea
- Sweden
- South Africa
- Egypt
- Indonesia
- Lithuania
- Finland
- Hungary
- Czech Republic
- Hong Kong
- Malaysia
- Slovakia
- Australia
- Russia
- Jordan
- Latvia
- Argentina
- Slovenia
- Malta
- Poland
- Denmark
- Austria
Why It Matters
No EPA sector or FDA product records name a use for this chemical.
Vendor Pricing
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
35 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 | $0.43 | 500 g | 98% |
| Aaron Chemicals LLC | Hong Kong | $0.45 | 100 g | 97% |
| Combi-Blocks, Inc. | United States | $0.47 | 500 g | 95% |
| Angene Chemical | China → Hong Kong | $0.53 | 500 g | 97% |
| Chemscene | United States | $0.54 | 500 g | — |
| BLD Pharmatech Co., Limited | United States | $0.55 | 500 g | 97% |
| BLD Pharmatech GmbH | Germany | $0.55 | 500 g | 97% |
| BLD Pharmatech Ltd. | China | $0.55 | 500 g | 97% |
| Ambeed, Inc. | United States | $0.55 | 500 g | 97% |
| AK Scientific Specialized | United States | $0.56 | 100 g | 95% |
| Synthonix | United States | $0.68 | 500 g | 95% |
| AK Scientific, Inc. | United States | $0.75 | 100 g | 98% |
| Fluorochem EU | Germany | $0.97 | 25 g | 95% |
| Biopharma PEG Scientific Inc. | United States | $1.10 | 500 g | 96% |
| AstaTech, Inc | United States | $1.18 | 100 g | 95% |
| Angene International Limited | United States | $1.22 | 100 g | 98% |
| Key Organics Ltd. | United Kingdom | $1.88 | 50 g | 95% |
| Apollo Scientific UK | United Kingdom | $1.92 | 25 g | 95% |
| Acrotein ChemBio, Inc. | United States | $2.06 | 100 g | — |
| Aldlab | United States | $3.31 | 5 g | 95% |
| ALFA AESAR | Germany | $6.49 | 100 g | 98% |
| Fluorochem UK | United Kingdom | $7.15 | 1 g | 95% |
| Accela ChemBio | United States | $10.00 | 1 g | 98% |
| Sigma-Aldrich (Rush Stock) | Germany | $11.10 | 10 g | 97% |
| Sigma-Aldrich | Germany | $11.10 | 10 g | 97% |
| TargetMol Chemicals | China → United States | $32.50 | 2 g | 98% |
| Interbioscreen | Hong Kong | $41.00 | 10 g | 95% |
| ChemDiv, Inc. | United States | $75.00 | 25 g | 90% |
| HTS Biochemie Innovationen | Germany | $120.00 | 10 g | 95% |
| Specs | Netherlands | $376.31 | 1 g | 90% |
| Labotest KG | Germany | $453.00 | 1000 mg | 90% |
| Otava, Ltd. | Ukraine | $2280.00 | 50 mg | 95% |
| Princeton BioMolecular Research (SC) | United States | $2900.00 | 100 mg | 90% |
| Vitas M Chemical Limited | Hong Kong | $3170.00 | 100 mg | 90% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 97% |
Chemical Identity
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
4H-1-Benzopyran-4-one, 2,3-dihydro- (CAS 491-37-2) https://chemicalindependence.com/chemical/491-37-2/ EPA TSCA Inventory: CAS 491-37-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293299 for CAS 491-37-2. Reporting year: 2024. https://usatrade.census.gov/