2-Butynedioic acid, 1,4-dimethyl ester
CAS 762-42-5
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 291719 · basket
These shares come from HS customs code 291719, which covers 176 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Taiwan
- Netherlands
- Switzerland
- Mexico
- South Africa
- Denmark
- Malaysia
- Ukraine
- Colombia
- Hong Kong
- Slovakia
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.
25 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 | $0.16 | 500 g | 98% |
| A2B Chem LLC | United States | $0.19 | 1 kg | 96% |
| AA BLOCKS | United States | $0.19 | 500 g | 96% |
| Fluorochem EU | Germany | $0.25 | 1 kg | 95% |
| Fluorochem UK | United Kingdom | $0.25 | 1 kg | 95% |
| Chemscene | United States | $0.27 | 500 g | — |
| Ambeed, Inc. | United States | $0.28 | 500 g | 98% |
| Combi-Blocks, Inc. | United States | $0.32 | 1 kg | 98% |
| Apollo Scientific US | United Kingdom | $0.33 | 250 g | 98% |
| Manchester Organics | United Kingdom | $0.34 | 250 g | 97% |
| MedChemExpress MCE | Sweden | $0.34 | 500 g | — |
| Acrotein ChemBio, Inc. | United States | $0.34 | 1 kg | — |
| AK Scientific Specialized | United States | $0.71 | 500 g | 95% |
| AK Scientific, Inc. | United States | $0.99 | 500 g | 98% |
| AstaTech, Inc | United States | $1.86 | 50 g | 95% |
| Angene International Limited | United States | $2.10 | 10 g | 99% |
| ALFA AESAR | Germany | $2.38 | 100 g | 98% |
| Sigma-Aldrich (Rush Stock) | Germany | $3.27 | 25 g | 99% |
| Sigma-Aldrich | Germany | $3.27 | 25 g | 99% |
| Interbioscreen | Hong Kong | $51.00 | 10 g | 95% |
| Labotest KG | Germany | $453.00 | 1000 mg | 90% |
| Otava, Ltd. | Ukraine | $2280.00 | 50 mg | 95% |
| Otava, Ltd. (2 weeks) | Ukraine | $2724.00 | 50 mg | 95% |
| Princeton BioMolecular Research (SC) | United States | $2900.00 | 100 mg | 90% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 98% |
Chemical Identity
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
2-Butynedioic acid, 1,4-dimethyl ester (CAS 762-42-5) https://chemicalindependence.com/chemical/762-42-5/ EPA TSCA Inventory: CAS 762-42-5. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 291719 for CAS 762-42-5. Reporting year: 2024. https://usatrade.census.gov/