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S-Ethyl-L-cysteine

Also known as: H-Cys(Et)-OH, 3-(Ethylthio)alanine, 5-ETHYL-L-CYSTEINE, Aids-034431, Aids034431, L-2-Amino-3-aethylmercapto-propionsaeure, Nsc49244, S-Aethyl-L-cystein, S-ethyl cysteine, S-ethyl-L-cysteine crystalline

S-Ethyl-L-cysteine (CAS 2629-59-6) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H11NO2S and a molecular weight of 149.21100 g/mol. Key properties include a melting point of 260ºC, a boiling point of 289.2ºC at 760mmHg, a density of 1.206g/cm3 and a flash point of 128.7ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
2629-59-6
Jingsj CID
J-1413742-9
Molecular Formula
C5H11NO2S
Molecular Weight
149.21100 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Melting Point260ºC
Boiling Point289.2ºC at 760mmHg
Density1.206g/cm3
Flash Point128.7ºC
Exact Mass149.05100
PSA88.62000
LogP0.85170
Vapor Pressure0.00908mmHg at 25°C
Refractive Index1.504
Storage Conditions−20°C

Customs & Trade Information

HS Code2930909090
Summary2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of S-Ethyl-L-cysteine?

The CAS number of S-Ethyl-L-cysteine is 2629-59-6.

What are the molecular formula and molecular weight of S-Ethyl-L-cysteine?

S-Ethyl-L-cysteine has molecular formula C5H11NO2S and molecular weight 149.21100 g/mol.

What are the upstream and downstream products of S-Ethyl-L-cysteine?

For S-Ethyl-L-cysteine, Upstream Products: Bromoethane, L-Cysteine hydrochloride anhydrous, L-Cysteine; Downstream Products: Methylthioethane, Ethanethiol, ch3cho.

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

Last updated:

How to cite: Jingsj. "S-Ethyl-L-cysteine (CAS 2629-59-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1413742-9 (accessed 2026-11-09).

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