Oxybutynin EP Impurity B CAS 14943-53-4
| CAS No. | 14943-53-4 |
| Molecular Formula | C22H25NO3 |
| Molecular Weight | 351.44 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Oxybutynin EP Impurity B (C22H25NO3) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. Its high carbon-to-hydrogen ratio confers good lipid solubility, 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).
Oxybutynin EP Impurity B (CAS 14943-53-4) is a certified pharmaceutical impurity reference standard with the molecular formula C22H25NO3 and a molecular weight of 351.44 g/mol.
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
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 | C22H25NO3 |
| Molecular Weight | 351.44 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1961 |
| Nitrogen Atoms | 1 |
Related Oxybutynin Standards
- Oxybutynin (CAS 5633-20-5)
- Oxybutynin impurity 10 (CAS CATO-C4X-197210)
- Oxybutynin EP Impurity C (CAS 1199574-70-3)
- Oxybutynin Impurity N1 (Mixture of Diastereomers) (CAS 1199574-71-4)
- Oxybutynin Impurity A (CAS CATO-C4X-197212)
- Oxybutynin Impurity 7 (CAS CATO-C4X-19727)
- R-Oxybutynin D10 (CAS CATO-C4X-197215)
- S-Oxybutynin D10 (CAS CATO-C4X-197216)
Recommended Standards
- Methylene blue /Methylthioninium Chloride Impurity 23 (CAS CATO-C4X-189623)
- Doxapram Impurity 44 (CAS CATO-C4X-197344)
- Olopatadine Impurity 51 (CAS 113806-01-2)
- Solriamfetol Impurity 26 (CAS CATO-C4X-256326)
- Pravastatin EP Impurity G Sodium Salt (CAS 720666-74-0)
- Caspofungin impurity 59 (CAS CATO-C4X-157559)
- Tenofovir Impurity 34 (CAS CATO-C4X-107634)
- 4-(2-(Methylamino)ethyl)benzoic acid (CAS 1199775-41-1)
- Chlorodimorpholinophosphine (CAS 75302-66-8)
- 3,3'-(Piperazine-1,4-diyl)bis(2-hydroxypropane-1-sulfonic acid) dihydrate (CAS 918131-36-9)
- (Z)-6-hydroxy-2-(2-methoxybenzylidene)-7-methylbenzofuran-3(2H)-one (CAS 1092298-15-1)
- 4-(3-Methoxybenzyl)piperidin-4-amine (CAS 919112-70-2)
- 1,4-Difluoro-2-(2-nitroethyl)benzene (CAS 1017082-18-6)
- Semaglutide Impurity 115 (CAS CATO-C4X-2226115)
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