Finasteride Impurity 33 CAS 35498-66-9
| CAS No. | 35498-66-9 |
| Molecular Formula | C20H30O3 |
| Molecular Weight | 318.45 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Owing to a steroid core, a hydroxyl group, an ether linkage, Finasteride Impurity 33 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 318.45 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
As a process- or degradation-related impurity, Finasteride Impurity 33 (CAS 35498-66-9, C20H30O3) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
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.
CATO manufactures Finasteride Impurity 33 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C20H30O3 |
| Molecular Weight | 318.45 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1967 |
Related Finasteride Standards
- Finasteride Impurity N50 (CAS 10325-79-8)
- Finasteride Impurity 32 (CAS 51872-67-4)
- Finasteride Impurity 31 (CAS 1667725-37-2)
- Finasteride Impurity 34 (CAS 73711-89-4)
- Finasteride Impurity 36 (CAS CATO-C4X-164536)
- Finasteride Impurity 35 (CAS CATO-C4X-164535)
- Finasteride Impurity 43 (CAS 104214-61-1)
- Finasteride Impurity 14 (CAS 302-97-6)
Recommended Standards
- Gabapentin impurity 34 (CAS CATO-C4X-165434)
- Andrograpanin(P) (CAS 82209-74-3)
- Levonorgestrel Impurity 38 (CAS 2762739-32-0)
- 898757-24-9 Ethyl 7-oxo-7-(4-n-pentylphenyl)heptanoate MFCD02261402 (CAS 898757-24-9)
- Dotinurad Impurity 188 (CAS CATO-C4X-2494188)
- Tivozanib Impurity 18 (CAS CATO-C4X-340018)
- Apixaban Impurity 167 (CAS CATO-C4X-1088167)
- o,m-Quaterphenyl (CAS 1165-57-7)
- 4-tert-Butylcyclohexanone diethyl acetal (CAS 1900-58-9)
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- Fmoc-Asp(OcHex)-OH (CAS 130304-80-2)
- (3S,4S)-4-(4-(Benzyloxy)phenyl)-3-((S)-1,2-dihydroxyethyl)-1-(4-fluorophenyl)azetidin-2-one (CAS 221349-56-0)
- Smac-N7 Peptide (CAS 401913-57-3)
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