DL-Cysteine
Also known as: (±)-2-Amino-3-mercaptopropionic acid, 2-Amino-3-mercaptopropanoic acid, 2-Amino-3-mercaptopropionic acid, DL-2-Amino-3-mercaptopropionic acid, DL-β-Mercaptoalanine, DL-Cysteine free base, Cysteine, DL-, Carbocistein Impurity 2, MFCD00004881, EINECS 222-160-2, hydrogen cysteinate
DL-Cysteine (CAS 3374-22-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C3H7NO2S and a molecular weight of 121.16 g/mol. Key properties include a melting point of 225ºC (dec.), a boiling point of 293.9±35.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 131.5±25.9 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H314 — Causes severe skin burns and eye damage and H335 — May cause respiratory irritation. It is listed by 1 supplier, from 4.84 to 6.00 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 3374-22-9
- Jingsj CID
- J-1119404-0
- Molecular Formula
- C3H7NO2S
- Molecular Weight
- 121.16 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
Made to Order | 95% 500g | ¥2,420.00 | $0.72 /gBest ¥4.84/g CNY | CN China MOQ 500g | |
Made to Order | 97% 100g | ¥520.00 | $0.78 /g ¥5.20/g CNY | CN China MOQ 100g | |
In Stock | 97% 25g | ¥150.00 | $0.9 /g ¥6.00/g CNY | CN China MOQ 5g |
Physicochemical Properties
| Melting Point | 225ºC (dec.) |
|---|---|
| Boiling Point | 293.9±35.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 131.5±25.9 °C |
| Exact Mass | 121.019745 |
| PSA | 102.12000 |
| LogP | 0.23 |
| Vapor Pressure | 0.0±1.3 mmHg at 25°C |
| Refractive Index | 1.550 |
| SMILES | C(C(C(=O)O)N)S |
| InChIKey | XUJNEKJLAYXESH-UHFFFAOYSA-N |
| InChI | 1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6) |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H314 — Causes severe skin burns and eye damage
- H335 — May cause respiratory irritation
Activity & Biological Data
| Additional Information | [1]. Luckose F, et al. Effects of amino acid derivatives on physical, mental, and physiological activities. Crit Rev Food Sci Nutr. 2015;55(13):1793-807. |
|---|
Customs & Trade Information
| HS Code | 2930909090 |
|---|---|
| Summary | 2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of DL-Cysteine?
The CAS number of DL-Cysteine is 3374-22-9.
What are the molecular formula and molecular weight of DL-Cysteine?
DL-Cysteine has molecular formula C3H7NO2S and molecular weight 121.16 g/mol.
Which suppliers offer DL-Cysteine?
1 supplier(s) listed; reference unit price ¥4.84–6.00 /g.
Is DL-Cysteine hazardous?
DL-Cysteine has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H314 — Causes severe skin burns and eye damage; H335 — May cause respiratory irritation.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "DL-Cysteine (CAS 3374-22-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1119404-0 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.