2-(Methylthio)-4(5H)-thiazolone

Also known as: 4(5H)-Thiazolone, 2-(methylthio)-, 2-(Methylsulfanyl)-1,3-thiazol-4(5H)-one, 2-(methylsulfanyl)-4,5-dihydro-1,3-thiazol-4-one, 2-(methylthio)thiazol-4(5H)-one, 2-methylsulfanyl-thiazol-4-one, 4(5H)-Thiazolone,2-(methylthio)-(9CI)

2-(Methylthio)-4(5H)-thiazolone (CAS 20949-66-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H5NOS2 and a molecular weight of 147.21900 g/mol. Key properties include a melting point of 82ºC, a boiling point of 249ºC, a density of 1.49 and a flash point of 105ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 20949-66-0
Jingsj CID: J-1386925-5
Molecular Formula: C₄H₅NOS₂
Molecular Weight: 147.21900 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	82ºC
Boiling Point	249ºC
Density	1.49
Flash Point	105ºC
Exact Mass	146.98100
PSA	80.03000
LogP	0.41440

Customs & Trade Information

HS Code	2934100090
Summary	2934100090 other compounds containing an unfused thiazole ring (whether or not hydrogenated) in the structure VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 2-(Methylthio)-4(5H)-thiazolone?

The CAS number of 2-(Methylthio)-4(5H)-thiazolone is 20949-66-0.

What are the molecular formula and molecular weight of 2-(Methylthio)-4(5H)-thiazolone?

2-(Methylthio)-4(5H)-thiazolone has molecular formula C4H5NOS2 and molecular weight 147.21900 g/mol.

What are the upstream and downstream products of 2-(Methylthio)-4(5H)-thiazolone?

For 2-(Methylthio)-4(5H)-thiazolone, Upstream Products: Rhodanine, iodomethane, Dimethyl sulfate; Downstream Products: 2,4-Thiazolidinedione.

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. "2-(Methylthio)-4(5H)-thiazolone (CAS 20949-66-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1386925-5 (accessed 2026-11-09).

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