21H,23H-Porphine, 5,10,15,20-tetraphenyl-
CAS 917-23-7
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 293399 · basket
These shares come from HS customs code 293399, which covers 518 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Taiwan
- Poland
- Canada
- Ivory Coast
- Greece
- Hungary
- Indonesia
- Latvia
- Belgium
- Slovakia
- Czech Republic
- Austria
- Netherlands
- Finland
- Denmark
- Croatia
- Australia
- South Africa
- Sweden
- Hong Kong
- Malta
- Singapore
- Lithuania
- Malaysia
- Oman
- Serbia
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.
31 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 |
|---|---|---|---|---|
| Aaron Chemicals LLC | Hong Kong | $3.16 | 500 g | 95% |
| AA BLOCKS | United States | $3.49 | 100 g | 95% |
| Angene Chemical | China → Hong Kong | $3.53 | 100 g | 95% |
| Combi-Blocks, Inc. | United States | $4.20 | 100 g | 97% |
| Chemscene | United States | $4.23 | 100 g | — |
| BLD Pharmatech Co., Limited | United States | $4.41 | 100 g | 95% |
| Ambeed, Inc. | United States | $4.41 | 100 g | 95% |
| BLD Pharmatech GmbH | Germany | $4.43 | 100 g | 95% |
| BLD Pharmatech Ltd. | China | $4.43 | 100 g | 95% |
| Fluorochem EU | Germany | $5.18 | 25 g | 95% |
| AK Scientific, Inc. | United States | $5.94 | 100 g | 97% |
| Fluorochem UK | United Kingdom | $6.15 | 10 g | 95% |
| MedChemExpress MCE | Sweden | $6.26 | 100 g | 99.43% |
| Menai Organics Limited | United Kingdom | $7.15 | 10 g | — |
| Angene International Limited | United States | $9.20 | 5 g | 95% |
| Manchester Organics | United Kingdom | $9.87 | 5 g | — |
| Key Organics Ltd. | United Kingdom | $16.10 | 10 g | 95% |
| AstaTech, Inc | United States | $16.20 | 25 g | 95% |
| MedKoo Biosciences, Inc | United States | $36.00 | 25 g | 98% |
| ALFA AESAR | Germany | $45.46 | 25 g | — |
| Sigma-Aldrich (Rush Stock) | Germany | $67.55 | 25 g | 97% |
| Sigma-Aldrich | Germany | $67.55 | 25 g | 97% |
| Apollo Scientific US | United Kingdom | $84.00 | 250 mg | 95% |
| Labotest KG | Germany | $217.80 | 5000 mg | 90% |
| A2B Chem LLC (2 weeks) | United States | $1708.00 | 1 g | 95% |
| AA BLOCKS (2 weeks) | United States | $1748.00 | 1 g | 95% |
| Otava, Ltd. | 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% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 95% |
| Interbioscreen | Hong Kong | $13723.33 | 15 mg | 95% |
Chemical Identity
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
21H,23H-Porphine, 5,10,15,20-tetraphenyl- (CAS 917-23-7) https://chemicalindependence.com/chemical/917-23-7/ EPA TSCA Inventory: CAS 917-23-7. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293399 for CAS 917-23-7. Reporting year: 2024. https://usatrade.census.gov/