Fmoc-Cys(StBu)-OH CAS 73724-43-3
| CAS No. | 73724-43-3 |
| Molecular Formula | C22H25NO4S2 |
| Molecular Weight | 431.57 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 431.57 g/mol gives Fmoc-Cys(StBu)-OH distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
CATO supplies Fmoc-Cys(StBu)-OH (CAS 73724-43-3), a certified reference material (molecular formula C22H25NO4S2, MW 431.57 g/mol) for analytical method development and quality control.
Fmoc-Cys(StBu)-OH (C22H25NO4S2) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C22H25NO4S2 |
| Molecular Weight | 431.57 g/mol |
| Purity | >95% |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1978 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 2 |
Related Fmoc Standards
- Fmoc-D-Cys(StBu)-OH (CAS 501326-55-2)
- Fmoc-(4S,2RS)-2-phenylthiazolidine-4-carboxylicacid (CAS 1217510-53-6)
- Fmoc-3-methoxy-L-homophenylalanine (CAS 1260610-23-8)
- Fmoc-D-Hph(3-OMe)-OH (CAS 1260610-30-7)
- N-Fmoc-N-(2-(4-methoxyphenyl)ethyl)-Glycine (CAS 1286711-20-3)
- Fmoc-S-3-amino-4-(4-methoxyphenyl)-butyric acid (CAS 1352435-52-9)
- Fmoc-R-3-amino-4-(4-methoxyphenyl)-butyric acid (CAS 1421258-65-2)
- Fmoc-N-Me-D-Phe(4-OMe)-OH (CAS 193086-28-1)
Recommended Standards
- Dapoxetine Impurity 79 (CAS CATO-C4X-143979)
- Buspirone impurity 30 (CAS CATO-C4X-125830)
- 4-(3-(7-(4-Methylpiperazin-1-yl)-1H-benzo[d]imidazol-2-yl)-1H-indazol-6-yl)aniline (CAS 1132609-87-0)
- N-(5,6-dimethyl-1-octyl-1H-benzo[d]imidazol-4-yl)-4-fluorobenzenesulfonamide (CAS 338955-35-4)
- 1-benzyl-2-ethyl-4,6-diphenylpyridinium tetrafluoroborate (CAS 828940-79-0)
- 1-Methyl-2-phenylbenzimidazole (CAS 2622-63-1)
- (2E)-3-(2,5-Dimethoxyphenyl)-1-(3-nitrophenyl)prop-2-en-1-one (CAS 351339-40-7)
- 3-[(methylsulfanyl)methyl]pyrrolidine hydrochloride (CAS 1333729-77-3)
- N-(5-Bromo-2-nitrophenyl)-2-chloropyrimidin-4-amine (CAS 1394119-49-3)
- 8-bromo-3-fluoro-naphthalen-1-amine (CAS 2387597-86-4)
- 2,2-Dimethyl-N-((1-methyl-1H-pyrazol-5-yl)methyl)thietan-3-amine (CAS 1880028-28-3)
- Fmoc-D-norArg(Mtr)-OH (CAS 1313054-54-4)
- Benzyl 4-(2-methoxy-2-oxoethylidene)piperidine-1-carboxylate (CAS 40112-93-4)
- Semaglutide Impurity 165 (CAS CATO-C4X-2226165)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com