1,1′-[4,6-Dihydroxy-5-[3-(triethoxysilyl)propyl]-1,3-phenylene]bis[1-phenylmethanone]

CAS 166255-23-8

U.S. production volumes are classified as confidential business information.

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceNo public record

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023.

Where It Comes From

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports 2 lb

EPA-registered manufacturers (3)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Kcc · KR South Korea

Mom Holding

Norquay Technology

Why It Matters

Sectors

ElectronicsPaints & Coatings

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

Used in 2 sectors as 1 functional role.

•UV stabilizer in Electrical Equipment, Appliance, and Component Manufacturing (100%)Processing—incorporation into article
•UV stabilizer in Paint and Coating Manufacturing (1%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$8.80/gCombi-Blocks, Inc.

CountryUnited States

Pack$220.00 / 25 g

Purity95%

Vendors11 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

10 more vendors

Vendor	Country	$/g	Pack	Purity
A2B Chem LLC	United States	$9.52	25 g	95%
BLD Pharmatech Ltd.	China	$10.48	25 g	95%
AA BLOCKS	United States	$11.92	25 g	95%
BLD Pharmatech GmbH	Germany	$15.60	5 g	95%
Ambeed, Inc.	United States	$15.60	5 g	95%
Aaron Chemicals LLC	Hong Kong	$17.80	5 g	95%
Angene Chemical	China → Hong Kong	$20.60	5 g	95%
BLD Pharmatech Co., Limited	United States	$22.00	1 g	95%
AstaTech (2 weeks)	United States	$24.24	25 g	95%
Angene	China → Hong Kong	$4266.67	30 mg	95%

Chemical Identity

CAS166255-23-8

PubChem CID15219596

DTXSIDDTXSID30888757

FormulaC29H34O7Si

Mol. Weight522.7 g/mol

SMILESCCO[Si](CCCC1=C(C(=CC(=C1O)C(=O)C2=CC=CC=C2)C(=O)C3=CC=CC=C3)O)(OCC)OCC

Data Sources

EPA CompTox (DSSTox) · DTXSID30888757Retrieved 2026-04-06
PubChem · compound 15219596Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

1,1′-[4,6-Dihydroxy-5-[3-(triethoxysilyl)propyl]-1,3-phenylene]bis[1-phenylmethanone] (CAS 166255-23-8) https://chemicalindependence.com/chemical/166255-23-8/ EPA CompTox (DSSTox): DTXSID30888757. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID30888757 PubChem: 15219596. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/15219596 EPA Chemical Data Reporting: 166255-23-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 166255-23-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting