Fasudil Impurity 7 CAS 85-48-3
| CAS No. | 85-48-3 |
| Molecular Formula | C9H7NO3S |
| Molecular Weight | 209.22 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Fasudil Impurity 7 (C9H7NO3S) contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
CATO supplies Fasudil Impurity 7 (CAS 85-48-3), a pharmacopoeial impurity reference standard (molecular formula C9H7NO3S, MW 209.22 g/mol) used for the identification and quantification of trace impurities in APIs.
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
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 | C9H7NO3S |
| Molecular Weight | 209.22 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Fasudil Standards
- Fasudil Impurity N2 (CAS 23261-58-7)
- Fasudil Impurity 11 (CAS CATO-C4X-136511)
- Fasudil Impurity 15 (CAS 27655-40-9)
- Fasudil Impurity 16 (CAS 1263357-67-0)
- Fasudil Impurity 18 (CAS CATO-C4X-136518)
- Fasudil Impurity 19 (CAS CATO-C4X-136519)
- Fasudil Impurity 29 (CAS CATO-C4X-136529)
- Fasudil Impurity 30 (CAS CATO-C4X-136530)
Recommended Standards
- Tinidazole Impurity 24 (CAS CATO-C4X-193024)
- Cabozantinib Impurity 2 (CAS 918642-61-2)
- Lemborexant Impurity 96 (CAS CATO-C4X-304296)
- 2,2,2-Trifluoro-N-(1-(thiophen-2-yl)ethyl)ethan-1-amine (CAS 1016501-33-9)
- Sertraline Impurity 61 (CAS CATO-C4X-134461)
- Urapidil Impurity 94 (CAS CATO-C4X-192494)
- Levonorgestrel EP Impurity C (CAS 1337972-89-0)
- Siponimod impurity 32 (CAS CATO-C4X-247232)
- (R)-Vigabatrin (CAS 77162-51-7)
- Ethyl 2,2-difluoro-2-(2-fluorophenyl)acetate (CAS 698378-76-6)
- 2,4,5-Trimethoxybenzaldehyde (CAS 4460-86-0)
- Tris(8-hydroxyquinolinato)erbium (CAS 23606-16-8)
- 5-Fluoro-2-hydroxyphenyl(methyl) ketone (CAS 394-32-1)
- D-γ-Glu20-Side-Tirzepatide (CAS CATO-CPTD788929)
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