L-Homocystine
CAS 626-72-2
Butanoic acid, 4,4'-dithiobis[2-amino-, (2S,2'S)-
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 293090 · basket
These shares come from HS customs code 293090, which covers 418 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Israel
- Croatia
- Ukraine
- Slovakia
- United Arab Emirates
- Ireland
- Poland
- Lithuania
- Brazil
- Singapore
- Australia
- Armenia
- Hong Kong
- Vietnam
- Czech Republic
- Hungary
- Greece
- Russia
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.
20 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 |
|---|---|---|---|---|
| A2B Chem LLC | United States | $0.57 | 100 g | 95% |
| Angene Chemical | China → Hong Kong | $0.58 | 500 g | 95% |
| AA BLOCKS | United States | $0.64 | 100 g | 95% |
| Combi-Blocks, Inc. | United States | $0.79 | 500 g | 98% |
| Chemscene | United States | $0.97 | 500 g | — |
| BLD Pharmatech Co., Limited | United States | $0.97 | 500 g | 95% |
| BLD Pharmatech GmbH | Germany | $0.97 | 500 g | 95% |
| BLD Pharmatech Ltd. | China | $0.97 | 500 g | 95% |
| Ambeed, Inc. | United States | $0.97 | 500 g | 95% |
| Angene International Limited | United States | $1.06 | 500 g | 98% |
| Fluorochem EU | Germany | $1.36 | 25 g | 95% |
| Fluorochem UK | United Kingdom | $7.15 | 1 g | 95% |
| Cayman Europe | Estonia | $7.52 | 25 g | 95% |
| AstaTech (2 weeks) | United States | $8.00 | 5 g | 98% |
| MedChemExpress MCE | Sweden | $12.58 | 5 g | 95% |
| MedKoo Biosciences, Inc | United States | $26.00 | 25 g | 98% |
| TargetMol Chemicals EU | Austria | $29.00 | 1 g | 99.96% |
| Apexbio Technology LLC | United States | $200.00 | 500 mg | 98.05% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 95% |
| Molnova | China | $9800.00 | 5 mg | 99% |
Chemical Identity
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
L-Homocystine (CAS 626-72-2) https://chemicalindependence.com/chemical/626-72-2/ EPA TSCA Inventory: CAS 626-72-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293090 for CAS 626-72-2. Reporting year: 2024. https://usatrade.census.gov/