3,5,7,8,3',4',5'-Heptamethoxyflavone

Also known as: Hibiscetin heptamethyl ether, 3,3',4',5,5',7,8-Heptamethoxyflavone, 3,5,7,8-Tetramethoxy-2-(3,4,5-trimethoxyphenyl)-4H-chromen-4-one, 3,5,7,8-Tetramethoxy-2-(3,4,5-trimethoxyphenyl)chromen-4-one, 4H-1-Benzopyran-4-one, 3,5,7,8-tetramethoxy-2-(3,4,5-trimethoxyphenyl)-

3,5,7,8,3',4',5'-Heptamethoxyflavone (CAS 21634-52-6) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C22H24O9 and a molecular weight of 432.421 g/mol. Key properties include a boiling point of 621.5±55.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 269.2±31.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 21634-52-6
Jingsj CID: J-1956542-5
Molecular Formula: C₂₂H₂₄O₉
Molecular Weight: 432.421 g/mol
Category: Ketones
Last updated: 8/21/2026

Request MSDS / TDS

No offers for this compound yet.

Request a quote

Physicochemical Properties

Boiling Point	621.5±55.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	269.2±31.5 °C
Exact Mass	432.142029
PSA	94.82000
LogP	1.65
Vapor Pressure	0.0±1.8 mmHg at 25°C
Refractive Index	1.576

Activity & Biological Data

Additional Information	[1]. Azizuddin, et al. Tyrosinase inhibitory potential of natural products isolated from various medicinal plants. Nat Prod Res. 2011 Apr;25(7):750-3.

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 3,5,7,8,3',4',5'-Heptamethoxyflavone?

The CAS number of 3,5,7,8,3',4',5'-Heptamethoxyflavone is 21634-52-6.

What are the molecular formula and molecular weight of 3,5,7,8,3',4',5'-Heptamethoxyflavone?

3,5,7,8,3',4',5'-Heptamethoxyflavone has molecular formula C22H24O9 and molecular weight 432.421 g/mol.

What are the upstream and downstream products of 3,5,7,8,3',4',5'-Heptamethoxyflavone?

For 3,5,7,8,3',4',5'-Heptamethoxyflavone, Upstream Products: Dimethyl sulfate, Benzoic acid, 3,4,5-trimethoxy-, 1,1'-anhydride.

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. "3,5,7,8,3',4',5'-Heptamethoxyflavone (CAS 21634-52-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1956542-5 (accessed 2026-11-09).

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