Molekula
(S)-Carboxymethyl-L-cysteine
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
(S)-Carboxymethyl-L-cysteine is a synthetic amino acid derivative widely used as a mucolytic agent to thin mucus, aiding respiratory conditions like chronic bronchitis and cystic fibrosis. It also functions as an antioxidant and is incorporated into pharmaceuticals, dietary supplements, and skincare formulations for its protective and hydrating properties. This chemical has a CAS number of 638-23-3, with the molecular formula C5H9NO4S and a molecular weight of 179.19. It carries no signal word under standard classification, requiring storage between 2 to 8°C for stability. Molekula supplies (S)-Carboxymethyl-L-cysteine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
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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100 g — £62.00 per pack ex VAT · £74.40 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 | 2 to 8 °C |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| pKa | pKa = 1.84 |
Source: PubChem CID 193653 (DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 21213990 |
| CAS Number | 638-23-3 |
| IUPAC Name | (2R)-2-amino-3-(carboxymethylsulfanyl)propanoic acid |
| EC Number | 211-327-5 |
| Molecular Formula | C5H9NO4S |
| Molecular Weight | 179.19 |
| Exact Mass | 179.0252 |
| SMILES | C([C@@H](C(=O)O)N)SCC(=O)O |
| InChIKey | GBFLZEXEOZUWRN-VKHMYHEASA-N |
| InChI | InChI=1S/C5H9NO4S/c6-3(5(9)10)1-11-2-4(7)8/h3H,1-2,6H2,(H,7,8)(H,9,10)/t3-/m0/s1 |
| PubChem CID | 193653 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2930.90.4950 |
| 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, Portuguese, 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.
Synonyms
- carbocistein
- Carbocisteine
- carbocysteine
- Lisomucil
- Muciclar
- Mucodyne
- Mucolase
- Reomucil
- Rhinathiol
- Transbronchin
Frequently asked questions
What is (S)-Carboxymethyl-L-cysteine used for?
(S)-Carboxymethyl-L-cysteine is primarily used as a mucolytic agent in pharmaceuticals to help break down mucus, for example in the management of chronic obstructive pulmonary disease and chronic bronchitis.
What is the chemical formula and molecular weight of (S)-Carboxymethyl-L-cysteine?
The chemical formula is C5H9NO4S, and the molecular weight is 179.19 g/mol.
How should (S)-Carboxymethyl-L-cysteine be stored?
Store at 2 to 8°C in a cool, dry place, away from direct sunlight and moisture.
What grades or purities of (S)-Carboxymethyl-L-cysteine does Molekula supply?
Molekula supplies pharmaceutical-grade (USP/EP/JP) (S)-Carboxymethyl-L-cysteine. Contact us for specific assay/purity details.
Can Molekula supply (S)-Carboxymethyl-L-cysteine in bulk quantities?
Yes, we offer bulk quantities of (S)-Carboxymethyl-L-cysteine; minimum order quantities and packaging options vary—inquire for details.
What documentation comes with an order of (S)-Carboxymethyl-L-cysteine?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability and compliance.
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.