Eupatorin-5-methyl ether

Also known as: 3'-Hydroxy-4',5,6,7-tetramethoxyflavone, 3'-Hydroxy-5,6,7,4'-tetramethoxyflavone, 3-Hydroxy-4,5,6,7-tetramethoxyflavone, 2-(3-hydroxy-4-methoxyphenyl)-5,6,7-trimethoxychromen-4-one, Eupatorin 5-Methyl Ether, Eupatorin methyl ether, Eupatorinemethylether, 5-OMe-eupatorin, 3'-Desmethylsinensetin, DR 33

Eupatorin-5-methyl ether (CAS 21764-09-0) is a compound in the Ethers category listed in the Jingsj chemical database. It has the molecular formula C19H18O7 and a molecular weight of 358.34200 g/mol. Key properties include a melting point of 179-180ºC, a boiling point of 573.7ºC at 760mmHg, a density of 1.309g/cm3 and a flash point of 207.4ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 21764-09-0
Jingsj CID: J-1956188-8
Molecular Formula: C₁₉H₁₈O₇
Molecular Weight: 358.34200 g/mol
Category: Ethers
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	179-180ºC
Boiling Point	573.7ºC at 760mmHg
Density	1.309g/cm3
Flash Point	207.4ºC
Exact Mass	358.10500
PSA	87.36000
LogP	3.20000
Vapor Pressure	9.21E-14mmHg at 25°C
Refractive Index	1.593

Activity & Biological Data

Additional Information	[1]. Mirka Laavola, et al. Flavonoids Eupatorin and Sinensetin Present in Orthosiphon stamineus Leaves Inhibit Inflammatory Gene Expression and STAT1 Activation. Planta Med. 2012, 78, 08.

Customs & Trade Information

HS Code	2914509090
Summary	HS:2914509090 other ketones with other oxygen function VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:5.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Eupatorin-5-methyl ether?

The CAS number of Eupatorin-5-methyl ether is 21764-09-0.

What are the molecular formula and molecular weight of Eupatorin-5-methyl ether?

Eupatorin-5-methyl ether has molecular formula C19H18O7 and molecular weight 358.34200 g/mol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Eupatorin-5-methyl ether (CAS 21764-09-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1956188-8 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.