Description

I-But-Cys-Oh CAS NO 124529-02-8 is a specialized, non-proteinogenic amino acid derivative featuring an isobutyl side chain on the cysteine moiety. This compound is a critical building block in advanced peptide synthesis and pharmaceutical research, offering precise structural control for developing novel bioactive molecules. It is primarily utilized by research institutions and pharmaceutical companies engaged in the development of peptide-based therapeutics, enzyme inhibitors, and diagnostic agents.

Application

• Pharmaceutical Intermediates: A key chiral synthon for the synthesis of complex peptide-based drugs and active pharmaceutical ingredients (APIs).
• Peptide Synthesis: Serves as a protected or modified cysteine residue in solid-phase and solution-phase peptide synthesis for research and development.
• Biochemical Research: Used in studying enzyme mechanisms, protein-protein interactions, and as a tool compound in metabolic pathway analysis.
• Proteomics & Drug Discovery: Employed in the design and synthesis of peptide libraries for high-throughput screening and lead optimization.
• Material Science: Potential applications in creating functionalized surfaces or polymers with specific thiol-reactive properties.

Basic Information

Product Name	I-But-Cys-Oh CAS NO 124529-02-8
CAS No.	124529-02-8
Molecular Formula	C7H15NO2S
Molecular Weight	177.26 g/mol
Synonyms	Isobutylcysteine; (R)-2-Amino-3-(2-methylpropylthio)propanoic acid; S-Isobutyl-L-cysteine; L-Cysteine, S-(2-methylpropyl)-; 2-Amino-3-[(2-methylpropyl)thio]propanoic acid; NSC 339587; S-Isobutylcysteine; Isobutyl-L-cysteine
EINECS	Contact for details

Quality Control

Our I-But-Cys-Oh is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including chiral purity verification and impurity profiling, to ensure it meets the high standards required for pharmaceutical research. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming identity, purity, and compliance with agreed specifications.

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 should be handled in a dry environment to prevent degradation. For long-term storage, consider desiccants or inert atmosphere.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Identification (HPLC)	Conforms to reference
Assay (HPLC)	≥ 98.0%
Chiral Purity (HPLC)	≥ 99.0% ee
Water Content (KF)	≤ 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.