Molekula
N-Acetyl-L-cysteine
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
N-Acetyl-L-cysteine is a derivative of the amino acid L-cysteine used as a mucolytic agent and antioxidant, commonly in respiratory therapies and detoxification protocols. It has a CAS number of 616-91-1, molecular formula of HSCH₂CH(NHCOCH₃)CO₂H, and a molecular weight of 163.19 g/mol. Store at 2 to 8 °C. Signal word: Warning.
Molekula supplies N-Acetyl-L-cysteine at 98% min purity in 50 g, 100 g and 500 g packs, from £66.00 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 6 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
In stock — same-day dispatch
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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50 g — £55.00 per pack ex VAT · £66.00 inc. VAT
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100 g — £65.00 per pack ex VAT · £78.00 inc. VAT
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500 g — £270.10 per pack ex VAT · £324.12 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 | White crystalline powder |
| Melting Point | 106 - 112°C |
| Specific rotation | +21° - +25° |
| Heavy metals | <10ppm |
| pH | 2.0 - 2.8 |
| Loss on Drying | max 1.0% |
| Assay | 98% min |
| Residue on Ignition | max .5% |
| Iron (Fe) | <20ppm |
| Arsenic (As) | <1ppm |
| Ammonium (NH4+) | <0.02% |
| Sulphates (SO4)(2-) | <0.03% |
| State of Solution | >98% |
| Chlorine (Cl) | <0.04% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White, crystalline powder |
| Odour | Slight acetic odor |
| Melting Point | 109.5 °C |
| Solubility (other solvents) | Soluble in water, alcohol, hot isopropyl alcohol, methyl acetate, and ethyl acetate |
| Vapour Pressure | 1.1 × 10⁻⁵ mmHg at 25 °C (Estimated) |
| pKa | pKa = 9.52 (at 25 °C) |
| log P (octanol/water) | -0.66 |
Source: PubChem CID 12035 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 11557293 |
| CAS Number | 616-91-1 |
| IUPAC Name | (2R)-2-acetamido-3-sulfanylpropanoic acid |
| EC Number | 210-498-3 |
| Molecular Formula | HSCH2CH(NHCOCH3)CO2H |
| Molecular Weight | 163.19 |
| Exact Mass | 163.0303 |
| SMILES | CC(=O)N[C@@H](CS)C(=O)O |
| InChIKey | PWKSKIMOESPYIA-BYPYZUCNSA-N |
| InChI | InChI=1S/C5H9NO3S/c1-3(7)6-4(2-10)5(8)9/h4,10H,2H2,1H3,(H,6,7)(H,8,9)/t4-/m0/s1 |
| PubChem CID | 12035 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29309016 |
| Tariff Code | 2930901600 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H319 Causes serious eye irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- 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.
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
- Acetadote
- Acetilcisteina
- acetylcysteine
- Acetylcysteinum
- Brunac
- Fluimucetin
- L-Acetylcysteine
- mercapturic acid
- N-Acetylcysteine
- Respaire
Frequently asked questions
What is N-Acetyl-L-cysteine used for?
N-Acetyl-L-cysteine is commonly used as a mucolytic agent to break down mucus and as a precursor to glutathione for antioxidant support.
What is the chemical formula and molecular weight of N-Acetyl-L-cysteine?
The formula is HSCH2CH(NHCOCH3)CO2H and the molecular weight is 163.19 g/mol.
How should N-Acetyl-L-cysteine be stored?
It should be stored at 2 to 8 °C to maintain stability and prevent degradation.
What grade of N-Acetyl-L-cysteine does Molekula supply?
Molekula supplies N-Acetyl-L-cysteine as a white crystalline powder with an assay of 98% min, a melting point of 106 - 112°C and heavy metals below 10 ppm, as set out in the product specification.
Can Molekula supply N-Acetyl-L-cysteine in bulk quantities?
Yes, Molekula can supply N-Acetyl-L-cysteine in bulk; please contact our sales team for volume pricing and availability.
What documentation comes with an order of N-Acetyl-L-cysteine?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS) with the shipment.
Where can I buy N-Acetyl-L-cysteine?
Directly from Molekula, which lists N-Acetyl-L-cysteine in 50 g, 100 g and 500 g packs from £66.00 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.