S-isopropyl-L-cysteine CAS 5443-40-3
| CAS No. | 5443-40-3 |
| Molecular Formula | C6H13NO2S |
| Molecular Weight | 163.24 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
S-isopropyl-L-cysteine (CAS 5443-40-3), molecular formula C6H13NO2S and molecular weight 163.24 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, S-isopropyl-L-cysteine is typically white to off-white crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 163.24 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C6H13NO2S |
| Molecular Weight | 163.24 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 1.0 |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related S Standards
- (R)-Isopropyl 2-amino-3-mercaptopropanoate (CAS 79178-11-3)
- N-Isopropyl-1,3-propanesultam (CAS 279669-65-7)
- n-Isopropyl-3,4-dimethylaniline (CAS 105336-21-8)
- 1-Isopropyl-2-methyl-1,4,5,6-tetrahydrocyclopenta[b]pyrrole (CAS 93698-76-1)
- 1-Isopropyl-4,5,6,7-tetrahydro-1H-indole (CAS 91322-88-2)
- 3-isopropyl-4,5-dimethylaniline (CAS 96155-99-6)
- 4-Isopropyl-2,6-dimethylaniline (CAS 42014-59-5)
- 4-Isopropyl-N,N-dimethylaniline (CAS 4139-78-0)
Recommended Standards
- S-(4-Hydroxybutyl) methylcarbamothioate (CAS 652154-35-3)
- S-Methyl-D-penicillamine (CAS 29913-84-6)
- S-(2-Hydroxyethyl) isopropylcarbamothioate (CAS 61578-94-7)
- α-Methyl-DL-methionine (CAS 2749-07-7)
- 3-{[(4-fluorophenyl)sulfanyl]methyl}-1-benzofuran-2-carboxylic acid (CAS 1040084-06-7)
- 2-(5-Chloro-6-oxo-4-thiomorpholinopyridazin-1(6H)-yl)acetic acid (CAS 1707394-29-3)
- 4-Methyl-5-(2-(2-p-tolylpropan-2-yl)-pyrimidin-4-yl)thiazol-2-amine (CAS 1217487-36-9)
- 5-Hydroxy-1-methoxy-5,6,7,8-tetrahydronaphthalene-2-carbonitrile (CAS 2704566-09-4)
- 3-Methyl-5-nitrobenzene-1,2-diamine (CAS 70499-98-8)
- 1-(Pyrrolidin-3-yl)-1H-1,2,4-triazole oxalate (CAS 1956328-09-8)
- 2-(6-Chloro-5-cyano-3-(difluoromethyl)pyridin-2-yl)acetic acid (CAS 1806976-50-0)
- Ethyl 5,6,7,8-tetrahydro-4H-pyrazolo[1,5-a][1,4]diazepine-2-carboxylate;hydrochloride (CAS 1384080-92-5)
- Propan-2-amine hydroiodide (CAS 66735-20-4)
- Semaglutide impound 212 (CAS CATO-C4X-2226212)
Why CATO?
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