Favipiravir Impurity 9 CAS 1079990-21-8
| CAS No. | 1079990-21-8 |
| Molecular Formula | C5H3FN2O3 |
| Molecular Weight | 158.09 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| 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 Favipiravir Impurity 9.
CATO supplies Favipiravir Impurity 9 (CAS 1079990-21-8), a pharmacopoeial impurity reference standard (molecular formula C5H3FN2O3, MW 158.09 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, fluorine substitution, Favipiravir Impurity 9 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 158.09 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.
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 | C5H3FN2O3 |
| Molecular Weight | 158.09 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1988 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Favipiravir Standards
- Favipiravir Impurity 20 (CAS 356783-49-8)
- Favipiravir Impurity 37 (CAS 259794-01-9)
- Favipiravir (CAS 259793-96-9)
- Favipiravir Impurity 8 (CAS 356783-29-4)
- Favipiravir Impurity 21 (CAS 1207609-52-6)
- Favipiravir-13C3 (CAS CATO-C4X-210210)
- Favipiravir-13C3 (CAS CATO-CCAD303706)
- Favipiravir Impurity 6 (CAS 1374986-27-2)
Recommended Standards
- Phenylphosphonic acid (CAS 1571-33-1)
- 4-Methoxybenzoic acid-phenyl-<SUP>13</SUP>C<SUB>6</SUB> (CAS 1173022-97-3)
- 5-fluoro-2-nitropyridine 1-oxide (CAS 935753-02-9)
- 3,5-Difluoro-4-hydroxybenzaldehyde (CAS 118276-06-5)
- Niraparib Impurity 9 (CAS CATO-C4X-23299)
- Brexpiprazole Impurity 109 (CAS CATO-C4X-1131109)
- Vancomycin Impurity M (CAS CATO-C4X-177522)
- Bortezomib Impurity 43 (CAS 513-36-0)
- (2S,4R)-1-[(tert-butoxy)carbonyl]-4-(hydroxymethyl)pyrrolidine-2-carboxylic acid (CAS 273221-97-9)
- 2-Chloro-4-(methylsulfonyl)benzaldehyde (CAS 101349-95-5)
- Cinacalcet Impurity 65 (CAS 111171-94-9)
- 2,4-Difluorophenol 367-27-1 AS00157 ATTERCOP-CHM AT106413 PARAGOS 390212 PHENOL, 2,4-DIFLUORO- (CAS 367-27-1)
- (S)-8-(4-chlorophenyl)-9a-phenyl-9,9a-dihydropyrido[1,2-a]indole-6,10-dione (CAS 2368851-28-7)
- Semaglutide impurity 270 (CAS CATO-C4X-2226270)
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