Finasteride Impurity 34 CAS 73711-89-4
| CAS No. | 73711-89-4 |
| Molecular Formula | C20H31NO2 |
| Molecular Weight | 317.47 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 Finasteride Impurity 34.
As a process- or degradation-related impurity, Finasteride Impurity 34 (CAS 73711-89-4, C20H31NO2) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Finasteride Impurity 34 (C20H31NO2) 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 aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C20H31NO2 |
| Molecular Weight | 317.47 g/mol |
| Appearance | Off-white to pale 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1978 |
| Nitrogen Atoms | 1 |
Related Finasteride Standards
- Finasteride Impurity 31 (CAS 1667725-37-2)
- Finasteride Impurity 36 (CAS CATO-C4X-164536)
- Finasteride Impurity N50 (CAS 10325-79-8)
- Finasteride Impurity 32 (CAS 51872-67-4)
- Finasteride Impurity 33 (CAS 35498-66-9)
- Finasteride Impurity 43 (CAS 104214-61-1)
- Finasteride Impurity 14 (CAS 302-97-6)
- Finasteride Impurity 23 (CAS CATO-C4X-164523)
Recommended Standards
- Butenafine Impurity 14 (CAS 124830-38-2)
- Fingolimod Impurity 29 (CAS CATO-C4X-164629)
- Butenafine Impurity 11 (CAS 110951-99-0)
- Benzhexol Impurity 11 (CAS 161564-79-0)
- Tafamidis impurity 10 (CAS CATO-C4X-287710)
- Doxapram Impurity 9 (CAS 4695-13-0)
- Nicardipine Impurity 70 (CAS CATO-C4X-171070)
- 4-chloro-6-methyl-pyridin-2-amine (CAS 36340-61-1)
- 4-(2-Methoxyphenyl)-2-azetidinone (CAS 83725-16-0)
- 2-(5-Amino-3,4-dihydroquinolin-1(2H)-yl)-N-methylacetamide (CAS 1248163-12-3)
- 3,4-dimethylpent-3-enoic acid (CAS 14472-55-0)
- (s)-2-Amino-2-(4'-(trifluoromethyl)-[1,1'-biphenyl]-2-yl)ethan-1-ol (CAS 1213442-81-9)
- [(Methylthio)[[2-nitro-5-(propylthio)phenyl]amino]methylene]carbamic Acid Methyl Ester (CAS 88255-00-9)
- Insulin Degludec Impurity 13 (CAS CATO-C4X-215713)
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