Description

S-Phenyl-L-Cysteine is a non-proteinogenic amino acid derivative featuring a phenyl group attached to the sulfur atom of L-cysteine. This compound serves as a crucial chiral building block and intermediate in organic synthesis and pharmaceutical research. It is primarily utilized by research institutions and manufacturers in the pharmaceutical, biotechnology, and fine chemical sectors for applications such as peptide synthesis and biochemical studies.

Application

• Pharmaceutical Intermediate: A key chiral synthon in the synthesis of novel drug candidates, particularly those targeting cysteine protease enzymes or requiring specific thioether linkages.
• Peptide Synthesis: Used to incorporate a phenylthioether moiety into synthetic peptides, modifying their structure, stability, and biological activity for research and therapeutic development.
• Biochemical Research: Employed as a substrate or inhibitor in enzymatic studies, especially those involving sulfur metabolism or redox biology.
• Reference Standard: Serves as a high-purity analytical standard for quality control and method development in pharmaceutical and research laboratories.
• Ligand for Metal Complexation: The thioether and amino acid functional groups make it a potential ligand for constructing metal-organic complexes in catalysis or material science.
• Precursor for Specialty Chemicals: Acts as a starting material for the synthesis of more complex sulfur-containing organic molecules and fine chemicals.

Basic Information

Product Name	S-Phenyl-L-Cysteine
CAS No.	34317-61-8
Molecular Formula	C9H11NO2S
Molecular Weight	197.25 g/mol
Synonyms	(R)-2-Amino-3-(phenylthio)propanoic acid; L-Cysteine, S-phenyl-; S-Phenylcysteine; (2R)-2-Amino-3-(phenylsulfanyl)propanoic acid; Phenyl-L-cysteine; H-Phcys-OH; Fmoc-S-phenyl-L-cysteine; S-Benzyl-L-cysteine analog
EINECS	Contact for details

Quality Control

Our S-Phenyl-L-Cysteine is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity, chiral analysis to confirm enantiomeric excess, and identity confirmation via IR and NMR spectroscopy. A Certificate of Analysis (COA) detailing all specifications and test results is provided with every shipment to ensure traceability and compliance with your research or production requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed in a dry environment to prevent degradation. For long-term storage, consider using a desiccant.

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 (L-Isomer)
Loss on Drying	≤ 1.0%
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.