Description

S-Butyl-D-Cysteine is a specialized, non-proteinogenic amino acid derivative featuring a butylthio side chain in the D-configuration. This compound is valued for its role as a chiral building block and a key intermediate in the synthesis of complex molecules, particularly in pharmaceutical research and development. It is primarily utilized by researchers and manufacturers in the life sciences sector for applications in drug discovery, peptide chemistry, and the development of enzyme inhibitors.

Application

• Pharmaceutical Intermediate: A critical chiral synthon for the research and production of active pharmaceutical ingredients (APIs), especially those targeting cysteine proteases.
• Peptide Modification: Used to introduce a hydrophobic, thioether-containing side chain into synthetic peptides to alter their stability, bioavailability, and binding properties.
• Biochemical Research: Serves as a substrate analog or inhibitor in enzymatic studies to investigate reaction mechanisms and enzyme specificity.
• Ligand Synthesis: Employed in the preparation of specialized ligands for asymmetric catalysis and metal complexation.
• Reference Standard: Used as a high-purity analytical standard in quality control laboratories for method development and validation.

Basic Information

Product Name	S-Butyl-D-Cysteine
CAS No.	4134-56-9
Molecular Formula	C7H15NO2S
Molecular Weight	177.26 g/mol
Synonyms	D-2-Amino-3-(butylthio)propanoic acid; (R)-2-Amino-3-(butylthio)propionic acid; D-3-(Butylthio)alanine; (R)-3-(Butylthio)alanine; S-Butyl-D-cysteine; D-S-Butylcysteine; (2R)-2-Amino-3-(butylsulfanyl)propanoic acid
EINECS	Contact for details

Quality Control

Our S-Butyl-D-Cysteine is manufactured under a strict quality management system. 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 compliance with specified parameters.

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); ensure the container is kept tightly sealed in a low-humidity environment to prevent degradation.

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.