L-Selenocystine
L-硒代胱氨酸
Also known as: selenocystine, Seleno-L-cystine, (R,R)-3,3'-Diselenobis(2-aminopropionic acid), 3,3'-Diseleno-L-alanine, L-3,3'-Diselenodialanine, UNII:493154PTZ7, MFCD00800971, (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]diselanyl]propanoic acid, (2R,2'R)-3,3'-(1,2-Diselanediyl)bis(2-aminopropanoic acid)
L-Selenocystine (CAS 29621-88-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C6H12N2O4Se2 and a molecular weight of 334.091 g/mol. It is also known as selenocystine, Seleno-L-cystine and (R,R)-3,3'-Diselenobis(2-aminopropionic acid). Key properties include a melting point of 224.5-229.5ºC(lit.), a boiling point of 538.3±60.0 °C at 760 mmHg and a flash point of 279.3±32.9 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H331 — Toxic if inhaled and H373 — May cause damage to organs through prolonged exposure. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 29621-88-3
- Jingsj CID
- J-35385-4
- Molecular Formula
- C6H12N2O4Se2
- Chinese Name
- L-硒代胱氨酸
- Molecular Weight
- 334.091 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 224.5-229.5ºC(lit.) |
|---|---|
| Boiling Point | 538.3±60.0 °C at 760 mmHg |
| Flash Point | 279.3±32.9 °C |
| Exact Mass | 335.912750 |
| PSA | 126.64000 |
| LogP | 1.86 |
| Appearance | Powder | Yellow |
| Vapor Pressure | 0.0±3.1 mmHg at 25°C |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H331 — Toxic if inhaled
- H373 — May cause damage to organs through prolonged exposure
- H410 — Very toxic to aquatic life with long lasting effects
Activity & Biological Data
| Additional Information | [1]. Michio Iwaoka, et al. Synthesis of selenocysteine and selenomethionine derivatives from sulfur-containing amino acids. Chem Biodivers. 2008 Mar;5(3):359-74.Michio Iwaoka, et al. Synthesis of selenocysteine and selenomethionine derivatives from sulfur-containing amino acids. Chem Biodivers. 2008 Mar;5(3):359-74. |
|---|
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 L-Selenocystine?
The CAS number of L-Selenocystine is 29621-88-3.
What are the molecular formula and molecular weight of L-Selenocystine?
L-Selenocystine has molecular formula C6H12N2O4Se2 and molecular weight 334.091 g/mol.
Is L-Selenocystine hazardous?
L-Selenocystine has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H331 — Toxic if inhaled; H373 — May cause damage to organs through prolonged exposure.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "L-Selenocystine (CAS 29621-88-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-35385-4 (accessed 2026-10-29).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.