Molekula
L-Cysteine ethyl ester hydrochloride
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
L-Cysteine ethyl ester hydrochloride is a sulfur-containing amino acid derivative used in biochemical research, peptide synthesis, and as a reducing agent in cell culture and pharmaceutical formulations. It is available in powder form with a molecular weight of 185.67 g/mol, CAS number 868-59-7, and molecular formula HSCH2CH(NH2)COOC2H5 · HCl. Stable at ambient temperature, it requires no special storage conditions.
Molekula supplies L-Cysteine ethyl ester hydrochloride in 25 g packs, from £37.08 inc. VAT. It is made or sourced to order. Every batch ships with a certificate of analysis, and safety data sheets are available in 5 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
On backorder — expected to ship by 5 December 2026
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £30.90 per pack ex VAT · £37.08 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Solid |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 12901788 |
| CAS Number | 868-59-7 |
| IUPAC Name | ethyl (2R)-2-amino-3-sulfanylpropanoate;hydrochloride |
| EC Number | 212-779-6 |
| Molecular Formula | HSCH2CH(NH2)COOC2H5 · HCl |
| Molecular Weight | 185.67 |
| Exact Mass | 185.0277 |
| SMILES | CCOC(=O)[C@H](CS)N.Cl |
| InChIKey | JFKJWWJOCJHMGV-WCCKRBBISA-N |
| InChI | InChI=1S/C5H11NO2S.ClH/c1-2-8-5(7)4(6)3-9;/h4,9H,2-3,6H2,1H3;1H/t4-;/m0./s1 |
| PubChem CID | 2723617 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29309092 |
| Tariff Code | 2930901600 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- Cysteine ethyl ester hydrochloride
- Daiace (TN)
- Ethyl cysteinate hydrochloride
- ethyl cysteine hydrochloride
- Ethyl L-cysteinate hydrochloride
- Ethyl L-cysteine hydrochloride
- L-Cysteine, ethyl ester, hydrochloride (1:1)
- Mucastine
- Taiciscon
- Teincy
Frequently asked questions
What is L-Cysteine ethyl ester hydrochloride used for?
It is commonly used as a reducing agent in biochemical research and as a precursor in the synthesis of peptides and other sulfur-containing compounds.
What is the chemical formula and molecular weight?
The formula is HSCH2CH(NH2)COOC2H5 · HCl with a molecular weight of 185.67 g/mol.
How should L-Cysteine ethyl ester hydrochloride be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade is available?
Please contact us for current grade and purity information, custom specifications or higher purity options.
Can Molekula supply it in bulk?
Yes, we can supply L-Cysteine ethyl ester hydrochloride in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA); additional documentation such as MSDS or COO can be provided upon request.
Where can I buy L-Cysteine ethyl ester hydrochloride?
Directly from Molekula, which lists L-Cysteine ethyl ester hydrochloride in 25 g packs from £37.08 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.