5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one

Also known as: 5-Ethyl-6-methyl-3H-thieno[2,3-d]pyrimidin-4-one, 5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4-ol, Thieno[2,3-d]pyrimidin-4(1H)-one, 5-ethyl-6-methyl-, 5-ethyl-6-methyl-3H-thieno[2,3-d]pyrimidin-4-one

5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one (CAS 439692-89-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H10N2OS and a molecular weight of 194.25300 g/mol. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 439692-89-4
Jingsj CID: J-1118864-0
Molecular Formula: C₉H₁₀N₂OS
Molecular Weight: 194.25300 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Exact Mass	194.05100
PSA	73.99000
LogP	1.85540

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one?

The CAS number of 5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one is 439692-89-4.

What are the molecular formula and molecular weight of 5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one?

5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one has molecular formula C9H10N2OS and molecular weight 194.25300 g/mol.

What are the upstream and downstream products of 5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one?

For 5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one, Upstream Products: 3-Pentanone, 2-Pentanone, Ethyl 2-amino-4-ethyl-5-methylthiophene-3-carboxylate; Downstream Products: 4-Chloro-5-ethyl-6-methylthieno[2,3-d]pyrimidine.

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. "5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4(3H)-one (CAS 439692-89-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1118864-0 (accessed 2026-11-09).

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