S-(2-Aminoethyl)-L-cysteine hydrochloride
S-(2-Aminoethyl)-L-cysteine hydrochloride (CAS: 4099-35-8; Formula: C5H12N2O2S · HCl; MW: 200.69) is a modified amino acid. This compound is primarily utilised in biochemical research and as a reagent in laboratory settings. Its specific structure lends itself to applications requiring specialised amino acid derivatives for analytical or synthetic purposes.
- IUPAC
- L-4-Thialysine hydrochloride
- Synonyms
- L-4-Thialysine hydrochloride

Biochemical Research
Serves as a specialised building block or tool in various biochemical investigations, particularly those involving protein structure or function analysis where modified amino acids are required.
Laboratory Reagent
Utilised in research and development laboratories for synthetic chemistry or as a reference standard in analytical procedures. Its defined structure is crucial for reproducible experimental outcomes.
Modified Amino Acid Studies
Employed in studies focusing on the properties and reactivity of modified amino acids, contributing to a deeper understanding of their biological and chemical roles.
| Molecular weight | 200.69 |
|---|---|
| Empirical formula | C5H12N2O2S · HCl |
| Assay | ≥98% (TLC) |
| Storage temperature | 2-8°C |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is S-(2-Aminoethyl)-L-cysteine hydrochloride used for?
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S-(2-Aminoethyl)-L-cysteine hydrochloride is primarily used in biochemical research and as a laboratory reagent, particularly in studies involving modified amino acids.
What are the CAS number and formula for S-(2-Aminoethyl)-L-cysteine hydrochloride?
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The CAS number for S-(2-Aminoethyl)-L-cysteine hydrochloride is 4099-35-8, and its formula is C5H12N2O2S · HCl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies S-(2-Aminoethyl)-L-cysteine hydrochloride with an assay of ≥98% (TLC). This product is intended for laboratory and research use; TSS does not represent it as USP, BP, EP, or pharmacopoeia grade.
How should S-(2-Aminoethyl)-L-cysteine hydrochloride be handled?
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Handling requires appropriate personal protective equipment, including eyeshields and gloves. A type N95 (US) or type P1 (EN143) respirator filter is recommended. Observe WGK Germany rating of 3.
How is this chemical packed and shipped?
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This chemical is typically stored at 2-8°C. Tech Serve Solutions can export this product globally, adhering to all necessary shipping regulations.
How can I request a sample or quote?
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Please contact our sales team directly through the website to request a sample or a detailed quotation for S-(2-Aminoethyl)-L-cysteine hydrochloride.
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