Description

n-Acetyl-S-Benzyl-L-Cysteine is a chemically modified derivative of the amino acid L-cysteine, featuring protective acetyl and benzyl groups. This compound is a crucial building block and intermediate in advanced organic synthesis, particularly for the development of pharmaceuticals and biochemical research tools. It is primarily utilized by R&D chemists and process development scientists in the pharmaceutical, biotechnology, and fine chemical industries for applications such as peptide synthesis and as a precursor for active pharmaceutical ingredients (APIs).

Application

• Pharmaceutical Intermediate: A key chiral building block in the synthesis of complex drug molecules and active pharmaceutical ingredients (APIs).
• Peptide Synthesis: Used as a protected cysteine derivative in solid-phase and solution-phase peptide synthesis to prevent unwanted side reactions.
• Biochemical Research: Serves as a standard or reagent in studies involving thiol chemistry, enzyme inhibition, and protein structure-function analysis.
• Prodrug Development: Utilized in the design of prodrugs where the acetyl and benzyl groups modulate solubility, stability, and bioavailability.
• Chemical Reference Standard: Employed as a high-purity standard for analytical method development and quality control in chemical manufacturing.

Basic Information

Product Name	n-Acetyl-S-Benzyl-L-Cysteine
CAS No.	19542-77-9
Molecular Formula	C12H15NO3S
Molecular Weight	253.32 g/mol
Synonyms	N-Acetyl-S-benzylcysteine; S-Benzyl-N-acetyl-L-cysteine; N-Acetyl-S-(phenylmethyl)-L-cysteine; (2R)-2-Acetamido-3-(benzylsulfanyl)propanoic acid; Ac-Cys(Bzl)-OH; L-Cysteine, N-acetyl-S-benzyl-; NSC 334365
EINECS	243-158-4

Quality Control

Our n-Acetyl-S-Benzyl-L-Cysteine is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency, meeting the high standards required for pharmaceutical R&D and fine chemical synthesis. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming compliance with agreed specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and should be handled in a dry environment to prevent degradation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥98.0%
Specific Rotation	-30° to -35° (c=1 in methanol)
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.