L-Cystine dimethyl ester dihydrochloride
L-Cystine dimethyl ester dihydrochloride (CAS 32854-09-4) is a derivative of the amino acid cystine, presented as its dimethyl ester dihydrochloride salt. Its linear formula is CH3OCOCH(NH2)CH2SSCH2CH(NH2)COOCH3 · 2HCl, with a molecular weight of 341.28. This compound serves as a valuable building block in chemical synthesis and peptide chemistry, finding utility in research settings within chemical biology.

Chemical Synthesis
L-Cystine dimethyl ester dihydrochloride is employed as a precursor or reagent in the synthesis of more complex organic molecules, particularly those incorporating disulfide bridges or amino acid functionalities.
Peptide Chemistry
This compound can be utilised in the development and synthesis of peptides, acting as a protected form of cystine that allows for specific reactions and linkages.
Chemical Biology Research
It serves as a tool in chemical biology for studying biological processes, protein structure, and function where modified amino acids are of interest.
| Molecular weight | 341.28 |
|---|---|
| Linear formula | CH3OCOCH(NH2)CH2SSCH2CH(NH2)COOCH3 · 2HCl |
| Assay | ≥95% |
| Optical activity | [α]22/D −36.0°, c = 4% in methanol |
| Melting point | 182-183 °C (dec.)(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
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 L-Cystine dimethyl ester dihydrochloride used for?
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L-Cystine dimethyl ester dihydrochloride is used in chemical synthesis, peptide chemistry, and chemical biology research as a building block or reagent.
What is the CAS number and formula for L-Cystine dimethyl ester dihydrochloride?
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The CAS number is 32854-09-4 and the linear formula is CH3OCOCH(NH2)CH2SSCH2CH(NH2)COOCH3 · 2HCl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies L-Cystine dimethyl ester dihydrochloride with an assay of ≥95%. This product is not represented as USP, BP, EP, or any other pharmacopoeia grade.
How should L-Cystine dimethyl ester dihydrochloride be handled safely?
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Handle with appropriate personal protective equipment, including a dust mask type N95 (US), eyeshields, and gloves. Ensure adequate ventilation, as it may cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335).
Is L-Cystine dimethyl ester dihydrochloride exported by TSS?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including L-Cystine dimethyl ester dihydrochloride.
How can I request a sample or quote for L-Cystine dimethyl ester dihydrochloride?
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Please contact our sales team directly through our website or by phone to request a sample or a formal quotation for L-Cystine dimethyl ester dihydrochloride.
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