Pirfenidone Impurity 23 CAS 851518-71-3
| CAS No. | 851518-71-3 |
| Molecular Formula | C12H11NO2 |
| Molecular Weight | 201.22 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Pirfenidone Impurity 23 (CAS 851518-71-3), a pharmacopoeial impurity reference standard (molecular formula C12H11NO2, MW 201.22 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Pirfenidone Impurity 23 (C12H11NO2) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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).
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 | C12H11NO2 |
| Molecular Weight | 201.22 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Nitrogen Atoms | 1 |
Related Pirfenidone Standards
- Pirfenidone Impurity 10 (CAS CATO-C4X-222910)
- Pirfenidone Impurity 12 (CAS 887406-49-7)
- Pirfenidone Impurity 21 (CAS 887406-53-3)
- Pirfenidone Impurity 45 (CAS CATO-C4X-222945)
- Pirfenidone Impurity 8 (CAS CATO-C4X-22298)
- Pirfenidone Impurity 48 (CAS CATO-C4X-222948)
- Pirfenidone-d5 (5-Methyl-N-Phenyl-2-1H-Pyridone-d5) (CAS 1020719-62-3)
- Pirfenidone D3 (CAS 1093951-85-9)
Recommended Standards
- Finerenone Impurity 166 (CAS CATO-C4X-2880166)
- Hydantoin Impurity 27 (CAS 121565-48-8)
- Finerenone Impurity 171 (CAS CATO-C4X-2880171)
- Iguratimod Impurity 104 (CAS CATO-C4X-1826104)
- Dexmedetomidine Impurity 69 (CAS CATO-C4X-123069)
- Saxagliptin Impurity 21 (CAS 871727-40-1)
- Relebactam Impurity 152 (CAS CATO-C4X-2144152)
- 4-(1H-1,2,3-Triazol-5-yl)benzaldehyde (CAS 1022159-16-5)
- 4-Methyl-5-[1-phenyl-5-(1H-pyrrol-1-yl)-1H-pyrazol-4-yl]-4H-1,2,4-triazole-3-thiol (CAS 477709-23-2)
- (R)-1-Boc-2-isopropylpiperazine (CAS 674792-04-2)
- N-(2-(ethylthio)cyclohexyl)thietan-3-amine (CAS 1881375-96-7)
- D-(-)-2-phosphoglyceric Acid (CAS 3443-57-0)
- (R)-2-(aminooxy)propanoic acid hydrochloride (CAS 42989-99-1)
- Semaglutide impurity 29 (CAS 1188328-22-4)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com