Description

Cysteine, S-Methyl-, Ethyl Ester is a specialized, high-purity derivative of the amino acid cysteine, modified for enhanced stability and specific reactivity. This compound is valued for its role as a key chiral building block and a protected cysteine analog in advanced organic synthesis. It is primarily required by research institutions and manufacturers in the pharmaceutical, agrochemical, and fine chemical industries for applications such as peptide synthesis and the development of novel bioactive molecules.

Application

• Pharmaceutical Intermediate: Serves as a crucial chiral synthon in the research and development of new active pharmaceutical ingredients (APIs), particularly in peptide-based drugs.
• Peptide Synthesis: Used as a protected cysteine derivative in solid-phase and solution-phase peptide synthesis to introduce S-methyl cysteine motifs or as a precursor for further functionalization.
• Biochemical Research: Employed in proteomics and enzymology studies as a substrate analog or a tool compound to investigate protein structure and function.
• Agrochemical Synthesis: Acts as a building block for creating novel compounds with potential herbicidal or insecticidal activity.
• Fine Chemical Production: Utilized in the synthesis of complex molecules for flavors, fragrances, and advanced materials where specific stereochemistry is required.

Basic Information

Product Name	Cysteine, S-Methyl-, Ethyl Ester
CAS No.	792132-38-8
Molecular Formula	C6H13NO2S
Molecular Weight	163.24 g/mol
Synonyms	S-Methyl-L-cysteine ethyl ester; Ethyl (2R)-2-amino-3-(methylsulfanyl)propanoate; L-Cysteine, S-methyl-, ethyl ester; (R)-2-Amino-3-(methylthio)propionic acid ethyl ester; NSC 760463; S-Methylcysteine ethyl ester; Ethyl S-methylcysteinate; S-Methyl-L-cysteine ethylester
EINECS	Contact for details

Quality Control

Our Cysteine, S-Methyl-, Ethyl Ester is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including chiral purity verification by HPLC, to ensure it meets the high standards required for research and synthesis. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming identity, purity, and specific impurity profiles.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and should be handled under anhydrous conditions to maintain stability.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Chiral Purity (HPLC)	≥ 99.0% ee
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 10 ppm

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