S-Methyl-L-cysteine
Also known as: S-Methylcysteine, H-Cys(Me)-OH, (R)-2-Amino-3-(methylmercapto)propionic acid, S-Methyl-(R)-cysteine, 3-(Methylthio)alanine, (2R)-2-Amino-3-(methylsulfanyl)propanoic acid, L-3-(Methylthio)alanine, NSC 15387
S-Methyl-L-cysteine (CAS 1187-84-4) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H9NO2S and a molecular weight of 135.185 g/mol. Key properties include a melting point of ~240 °C (dec.), a boiling point of 242.8±30.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 100.7±24.6 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 1187-84-4
- Jingsj CID
- J-798861-6
- Molecular Formula
- C4H9NO2S
- Molecular Weight
- 135.185 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | ~240 °C (dec.) |
|---|---|
| Boiling Point | 242.8±30.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 100.7±24.6 °C |
| Exact Mass | 135.035400 |
| PSA | 88.62000 |
| LogP | 0.47 |
| Vapor Pressure | 0.0±1.0 mmHg at 25°C |
| Refractive Index | 1.509 |
Activity & Biological Data
| Additional Information | [1]. Thomas S, et al. Effect of s-methyl-L-cysteine on oxidative stress, inflammation and insulin resistance in male wistar rats fed with high fructose diet. Iran J Med Sci. 2015 Jan;40(1):45-50. |
|---|
Frequently Asked Questions
What is the CAS number of S-Methyl-L-cysteine?
The CAS number of S-Methyl-L-cysteine is 1187-84-4.
What are the molecular formula and molecular weight of S-Methyl-L-cysteine?
S-Methyl-L-cysteine has molecular formula C4H9NO2S and molecular weight 135.185 g/mol.
What are the upstream and downstream products of S-Methyl-L-cysteine?
For S-Methyl-L-cysteine, Upstream Products: S-Methyl-L-cysteine methyl ester hydrochloride, L-Cysteine, iodomethane; Downstream Products: Methanethiol, Dimethyl sulfide, L-Alanine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "S-Methyl-L-cysteine (CAS 1187-84-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-798861-6 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.