2-acetamido-5-chlorothiazole

Also known as: N-(5-chloro-1,3-thiazol-2-yl)acetamide, 2-Acetylamino-5-chlorothiazole, N-(5-chlorothiazol-2-yl)acetamide, MFCD01318098

2-acetamido-5-chlorothiazole (CAS 20256-39-7) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5ClN2OS and a molecular weight of 176.62400 g/mol. Key properties include a melting point of 208-210°C and a density of 1.507g/cm3. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 20256-39-7
Jingsj CID: J-47651-7
Molecular Formula: C₅H₅ClN₂OS
Molecular Weight: 176.62400 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	208-210°C
Density	1.507g/cm3
Exact Mass	175.98100
PSA	70.23000
LogP	1.82790
Refractive Index	1.633

GHS Safety & Compliance

IrritantSignal word: Warning

H302 — Harmful if swallowed
H315 — Causes skin irritation
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

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-acetamido-5-chlorothiazole?

The CAS number of 2-acetamido-5-chlorothiazole is 20256-39-7.

What are the molecular formula and molecular weight of 2-acetamido-5-chlorothiazole?

2-acetamido-5-chlorothiazole has molecular formula C5H5ClN2OS and molecular weight 176.62400 g/mol.

Is 2-acetamido-5-chlorothiazole hazardous?

2-acetamido-5-chlorothiazole has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.

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-acetamido-5-chlorothiazole (CAS 20256-39-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47651-7 (accessed 2026-11-09).

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