Fmoc-D-Cys(StBu)-OH CAS 501326-55-2
| CAS No. | 501326-55-2 |
| Molecular Formula | C22H25NO4S2 |
| Molecular Weight | 431.57 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-D-Cys(StBu)-OH.
Fmoc-D-Cys(StBu)-OH (CAS 501326-55-2), molecular formula C22H25NO4S2 and molecular weight 431.57 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C22H25NO4S2, Fmoc-D-Cys(StBu)-OH contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 431.57 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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.
As a certified reference material (CRM), Fmoc-D-Cys(StBu)-OH meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
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.) | 1984 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 2 |
Related Fmoc Standards
- Fmoc-Cys(StBu)-OH (CAS 73724-43-3)
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- N-Fmoc-N-(2-(4-methoxyphenyl)ethyl)-Glycine (CAS 1286711-20-3)
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