Fmoc-L-Cysteine CAS 135248-89-4
| CAS No. | 135248-89-4 |
| Molecular Formula | C18H17NO4S |
| Molecular Weight | 343.40 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Fmoc-L-Cysteine.
Fmoc-L-Cysteine (CAS 135248-89-4), molecular formula C18H17NO4S and molecular weight 343.40 g/mol, is a CATO reference standard with documented purity and traceability.
Fmoc-L-Cysteine (C18H17NO4S) 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. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
CATO manufactures Fmoc-L-Cysteine under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C18H17NO4S |
| Molecular Weight | 343.40 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, 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.) | 1995 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Fmoc Standards
- Fmoc-D-Cysteine (CAS 157355-80-1)
- Fmoc-3-Fluoroalanine-2-d<SUB>1</SUB> (CAS 1217451-08-5)
- Fmoc-Cys-NH? (CAS 623177-62-8)
- 4-(Fmoc-amino)benzyl Alcohol (CAS 475160-83-9)
- Fmoc-O-methyl-L-serine (CAS 159610-93-2)
- Fmoc-DL-homoserine (CAS 161125-35-5)
- Fmoc-L-homoserine (CAS 172525-85-8)
- 2-[2-(Fmoc-amino)ethoxy]acetic Acid (CAS 260367-12-2)
Recommended Standards
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- Tert-butyl 2-(((4-fluorophenyl)sulfonyl)methyl)pyrrolidine-1-carboxylate (CAS 1353973-85-9)
- Parecoxib Impurity 25 (CAS 1884279-18-8)
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- 15-Hydroxypentadecanehydrazide (CAS 18270-60-5)
- 2,6-dimethylmorpholine (CAS 141-91-3)
- 1794941-48-2 Chrysoeriol-d3 (CAS 1794941-48-2)
- 3-Acetyl-5-(4-chlorophenyl)-3aH-pyrrolo[3,4-d]isoxazole-4,6(5H,6aH)-dione (CAS 454473-68-8)
- 4-(3-Fluoro-4-methoxybenzoyl)-3-hydroxy-5-(3-hydroxyphenyl)-1-(pyridin-3-ylmethyl)-1H-pyrrol-2(5H)-one (CAS 618074-57-0)
- 3-(3-Oxo-2,3-dihydro-1H-pyrazol-4-yl)-4-thioxothiazolidin-2-one (CAS 630403-90-6)
- (Tyr9)-Cholecystokinin Octapeptide (sulfated) (H-9770.0005) (CAS 96607-61-3)
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