Description

Stefin D is a high-purity, synthetic cysteine protease inhibitor widely utilized in biochemical and pharmaceutical research. This compound is critical for studying intracellular proteolytic pathways and developing therapeutic agents targeting specific enzyme activities. It is essential for researchers and manufacturers in the fields of pharmaceutical development, life science research, and diagnostic reagent formulation.

Application

• Biochemical Research: Used as a potent and selective inhibitor of cathepsins (particularly cathepsin D) in enzymatic studies and pathway analysis.
• Pharmaceutical Development: Serves as a key reference standard and intermediate in the research of protease-targeted drugs for conditions like osteoporosis, cancer, and inflammatory diseases.
• Diagnostic Reagents: Employed in the formulation of assay kits and diagnostic tools designed to measure specific protease activity in biological samples.
• Cell Culture & Proteomics: Applied in cell-based assays to inhibit specific proteases, allowing for the study of protein degradation, apoptosis, and cellular signaling mechanisms.
• Academic Research: A fundamental tool in university and institutional labs for fundamental research in biochemistry, molecular biology, and enzymology.

Basic Information

Product Name	Stefin D
CAS No.	183869-09-2
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Stefin D; Cystatin D; CST5; Cysteine Protease Inhibitor D; Cathepsin D Inhibitor; Protease Inhibitor Stefin D; (S)-1-((S)-2-Amino-4-methylpentanamido)-N-((S)-1-(((S)-1-amino-3-(4-hydroxyphenyl)-1-oxopropan-2-yl)amino)-3-(1H-imidazol-4-yl)-1-oxopropan-2-yl)-3-(4-hydroxyphenyl)propanamide; 183869-09-2
EINECS	Contact for details

Quality Control

Our Stefin D is produced under strict quality management protocols to ensure batch-to-batch consistency and high purity suitable for research applications. Each lot undergoes comprehensive analytical testing, including HPLC for purity verification and identity confirmation. A detailed Certificate of Analysis (COA) documenting all test results is provided with every shipment to support your quality assurance and regulatory needs.

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 in a desiccated environment to maintain stability and potency.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Biological Activity	Contact for details

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.