Favipiravir Impurity 18 CAS 259793-97-0
| CAS No. | 259793-97-0 |
| Molecular Formula | C5H4N4O4 |
| Molecular Weight | 184.11 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Favipiravir Impurity 18 (CAS 259793-97-0), a pharmacopoeial impurity reference standard (molecular formula C5H4N4O4, MW 184.11 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Favipiravir Impurity 18 (C5H4N4O4) contains a carbohydrate-derived structure, an amide group. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 184.11 g/mol, it falls into the medium-molecular-weight range. 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).
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 | C5H4N4O4 |
| Molecular Weight | 184.11 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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 |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 2025 |
| Nitrogen Atoms | 4 |
Related Favipiravir Standards
- Favipiravir Impurity 13 (CAS CATO-C4X-210213)
- Favipiravir Impurity 16 (CAS 1023813-21-9)
- Favipiravir Impurity 5 (CAS 356783-16-9)
- Favipiravir Impurity 2 (CAS 259793-90-3)
- Favipiravir Impurity 1 (CAS CATO-C4X-21021)
- Favipiravir Impurity 23 (CAS 2091074-00-7)
- Favipiravir Impurity 23 (CAS 356783-14-7)
- Favipiravir-13C3 (CAS CATO-C4X-210210)
Recommended Standards
- Acipimox Impurity 18 (CAS CATO-C4X-186618)
- 2,4-Dinitrophenol (CAS 51-28-5)
- 2VC6P60SLN 7789-48-2 Magnesium bromide Magnesium bromide (MgBr2) EINECS 232-170-9 UNII-2VC6P60SLN (CAS 7789-48-2)
- 4-Fluoro-2-nitrobenzamide (CAS 106754-80-7)
- Vancomycin EP Impurity A (CAS 91700-98-0(Free Base))
- Eperisone Impurity 28 (CAS CATO-C4X-227928)
- Ruxolitinib Impurity 119 (CAS CATO-C4X-2058119)
- 2-({[(9h-fluoren-9-yl)methoxy]carbonyl}amino)-5-iodobenzoic acid (CAS 924817-95-8)
- Ethyl 6-(difluoromethoxy)-4-methylnicotinate (CAS 1079352-16-1)
- 3-Isoxazolecarboxylicacid, 5-(4-bromophenyl)-, ethyl ester 33277-15-5 CTK4H0310 (CAS 33277-15-5)
- 4-Hydrazinyl-7-methylquinoline hydrochloride (CAS 68500-38-9)
- 5',5'''-Bis(4-formylphenyl)-[1,1':3',1'':4'',1''':3''',1''''-quinquephenyl]-4,4''''-dicarbaldehyde (CAS 2417655-42-4)
- 3-Hydrazinyl-1,5-dimethyl-4-nitro-1H-pyrazole (CAS 209971-95-9)
- TRAF6 Control Peptide trifluoroacetate salt (CAS 852690-80-3)
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