Description

S-Ethylcysteine is a specialized organosulfur compound featuring a thioether linkage, serving as a key building block and intermediate in advanced chemical synthesis. Its value lies in its ability to introduce a protected cysteine moiety or act as a precursor for more complex sulfur-containing molecules, which is critical for research and development in life sciences. This product is essential for pharmaceutical researchers, agrochemical developers, and fine chemical manufacturers working on peptide mimetics, drug candidates, and novel bioactive compounds.

Application

• Pharmaceutical Intermediate: A crucial building block for the synthesis of novel drug candidates, particularly those targeting enzymes or receptors where the thioether group plays a key role.
• Peptide Chemistry & Research: Used in the preparation of modified peptides and peptide mimetics, where S-ethylcysteine acts as a protected or modified cysteine analog.
• Biochemical Research: Serves as a substrate or inhibitor in enzymatic studies, helping to elucidate metabolic pathways involving sulfur amino acids.
• Agrochemical Synthesis: An intermediate in the development of new pesticides or herbicides that utilize sulfur chemistry for enhanced activity or selectivity.
• Fine Chemical Production: Employed in the multi-step synthesis of complex, high-value specialty chemicals for various industrial applications.
• Reference Standard: Used as an analytical standard in quality control laboratories for method development and verification in pharmaceutical or chemical analysis.

Basic Information

Product Name	S-Ethylcysteine
CAS No.	2139-90-4
Molecular Formula	C5H11NO2S
Molecular Weight	149.21 g/mol
Synonyms	(2R)-2-Amino-3-(ethylsulfanyl)propanoic Acid; D-2-Amino-3-(ethylthio)propionic Acid; (R)-2-Amino-3-(ethylthio)propanoic Acid; S-Ethyl-D-cysteine; D-S-Ethylcysteine; Ethylcysteine; 3-(Ethylthio)-D-alanine
EINECS	218-387-6

Quality Control

Our S-Ethylcysteine is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity assessment and chiral purity verification, to ensure it meets the high standards required for research and synthesis. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting identity, purity, and specific impurity profiles. We support compliance with REACH and other global regulatory frameworks.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect stability and purity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Chiral Purity (HPLC)	≥ 99.0% (D-isomer)
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.