Description

L-Methylcysteine is a specialized sulfur-containing amino acid derivative with the CAS number 403804-39-7. This compound is valued for its role as a chiral building block and a precursor in advanced pharmaceutical synthesis and biochemical research. It is primarily sought by research institutions and manufacturers in the pharmaceutical, biotechnology, and fine chemical sectors for developing novel therapeutics and high-value intermediates.

Application

• Pharmaceutical Intermediate: A key chiral synthon for the synthesis of active pharmaceutical ingredients (APIs), particularly in oncology and metabolic disorder research.
• Biochemical Research: Used as a substrate or inhibitor in enzymatic studies and metabolic pathway analysis.
• Peptide Synthesis: Serves as a modified cysteine residue in the production of synthetic peptides and peptidomimetics for drug discovery.
• Nutritional Science Studies: Investigated for its potential role in sulfur amino acid metabolism and related nutritional applications.
• Cosmetic Ingredient Precursor: Employed in the research and development of advanced skincare actives targeting antioxidant and anti-aging properties.

Basic Information

Product Name	L-Methylcysteine
CAS No.	403804-39-7
Molecular Formula	C4H9NO2S
Molecular Weight	135.18 g/mol
Synonyms	(2R)-2-Amino-3-methylsulfanylpropanoic acid; (R)-2-Amino-3-(methylthio)propionic acid; L-α-Amino-β-methylmercaptopropionic acid; L-2-Amino-3-(methylthio)propanoic acid; L-Methylcysteine; Methyl-L-cysteine; (R)-2-Amino-3-(methylsulfanyl)propanoic acid
EINECS	Contact for details

Quality Control

Our L-Methylcysteine is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including chiral purity verification and impurity profiling by HPLC, to ensure it meets the high standards required for research and synthesis. Certificates of Analysis (COA) detailing purity, specific rotation, and residual solvent levels are provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and must be kept under dry, inert conditions to maintain stability and purity. For long-term storage, consider desiccated environments.

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
Specific Rotation	Contact for details
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.