Molekula
D-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
D-Cysteine is a synthetic amino acid used in pharmaceuticals, cosmetics, and biochemical research as a reducing agent and precursor in peptide synthesis. It appears as a white to off-white crystalline powder. CAS: 921-01-7, Molecular Formula: C3H7NO2S, Molecular Weight: 121.16 g/mol. Store at ambient temperature. Signal word: Warning. Molekula supplies D-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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1 g — $117.70 per pack
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 | 28831664 |
| CAS Number | 921-01-7 |
| IUPAC Name | (2S)-2-amino-3-sulfanylpropanoic acid |
| EC Number | 213-062-0 |
| Molecular Formula | C3H7NO2S |
| Molecular Weight | 121.16 |
| Exact Mass | 121.0197 |
| SMILES | C([C@H](C(=O)O)N)S |
| InChIKey | XUJNEKJLAYXESH-UWTATZPHSA-N |
| InChI | InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m1/s1 |
| PubChem CID | 92851 |
| REACH Code | Y110 |
| HTS Code | 29309092 |
| Tariff Code | 2930901300 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
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
- (2S)-2-amino-3-mercaptopropanoic acid
- (2S)-2-amino-3-sulfanylpropanoic acid
- (2S)-2-azaniumyl-3-sulfanylpropanoate
- (S)-2-amino-3-mercaptopropanoic acid
- (S)-Cysteine
- Cysteine, D-
- CYSTEINE. (S)-
- D-Amino-3-mercaptopropionic acid
- D-Cystein
- D-Zystein
Frequently asked questions
What is D-Cysteine used for?
D-Cysteine is used in pharmaceuticals, cosmetics, and as a chiral intermediate in organic synthesis.
What is the chemical formula and molecular weight of D-Cysteine?
The formula is C3H7NO2S with a molecular weight of 121.16 g/mol.
How should D-Cysteine be stored?
Store at ambient temperature, protected from moisture and light.
What grade of D-Cysteine is available?
Available in technical and pharmaceutical grade, depending on application needs.
Can Molekula supply D-Cysteine in bulk?
Yes, Molekula offers bulk quantities upon request.
What documentation comes with a D-Cysteine order?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS).
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.