L-Cystine
Also known as: (R,R)-3,3'-Dithiobis(2-aminopropanoic acid), (R,R)-cystine, Dicysteine, Cystine, (-)-Cystine, Oxidized L-cysteine, L-Cysteine disulfide, 3,3'-Dithiodialanine, Cystin, Acetylcysteine Impurity 1, EINECS 200-296-3, MFCD00064228, 3,3'-Disulfanediylbis(2-aminopropanoic acid)
L-Cystine (CAS 56-89-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C6H12N2O4S2 and a molecular weight of 240.301 g/mol. Key properties include a melting point of 260-261ºC, a boiling point of 468.2±45.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 237.0±28.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 56-89-3
- Jingsj CID
- J-1130822-8
- Molecular Formula
- C6H12N2O4S2
- Molecular Weight
- 240.301 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 260-261ºC |
|---|---|
| Boiling Point | 468.2±45.0 °C at 760 mmHg |
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 237.0±28.7 °C |
| Exact Mass | 240.023849 |
| PSA | 177.24000 |
| LogP | 1.23 |
| Vapor Pressure | 0.0±2.5 mmHg at 25°C |
| Refractive Index | 1.653 |
Activity & Biological Data
| Target | Human Endogenous Metabolite |
|---|---|
| Additional Information | [1]. Ohtsu I, et al. Uptake of L-cystine via an ABC transporter contributes defense of oxidative stress in the L-cystine export-dependent manner in Escherichia coli. PLoS One. 2015 Apr 2;10(3):e0120619. |
Customs & Trade Information
| HS Code | 2930901000 |
|---|
Frequently Asked Questions
What is the CAS number of L-Cystine?
The CAS number of L-Cystine is 56-89-3.
What are the molecular formula and molecular weight of L-Cystine?
L-Cystine has molecular formula C6H12N2O4S2 and molecular weight 240.301 g/mol.
What are the upstream and downstream products of L-Cystine?
For L-Cystine, Upstream Products: L-Cysteine, S-(4-Methoxybenzyl)-L-cysteine, Boc-Cys(Acm)-OH; Downstream Products: Dimethylamine, Trimethylamine, Dimethyl L-cystinate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "L-Cystine (CAS 56-89-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1130822-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.