Finasteride EP Impurity B CAS 103335-41-7
| CAS No. | 103335-41-7 |
| Molecular Formula | C20H29NO3 |
| Molecular Weight | 331.45 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 EP Impurity B.
Finasteride EP Impurity B (CAS 103335-41-7) is a certified pharmaceutical impurity reference standard with the molecular formula C20H29NO3 and a molecular weight of 331.45 g/mol.
Structurally, Finasteride EP Impurity B (C20H29NO3) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 331.45 g/mol, it falls into the moderately-high-molecular-weight range. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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 EP Impurity B 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 | C20H29NO3 |
| Molecular Weight | 331.45 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1986 |
| Nitrogen Atoms | 1 |
Related Finasteride Standards
- Finasteride Impurity 3-one-4-aza-5-androstene-17β-carboxylate methyl ester (CAS 104214-18-8)
- Finasteride Impurity N35 (CAS 7254-03-7)
- Finasteride Impurity 20 (CAS 73671-92-8)
- Finasteride Impurity 54 (CAS 1385262-95-2)
- Finasteride Impurity 35 (CAS CATO-C4X-164535)
- Finasteride Impurity N50 (CAS 10325-79-8)
- Finasteride Impurity 32 (CAS 51872-67-4)
- Finasteride Impurity 33 (CAS 35498-66-9)
Recommended Standards
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- CAS 101846-86-0 (CAS 101846-86-0)
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- 898777-16-7 Ethyl 7-oxo-7-{4-[(pyrrolidin-1-yl)methyl]phenyl}heptanoate DTXSID80642780 (CAS 898777-16-7)
- Sitafloxacin impurity 57 (CAS CATO-C4X-115557)
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- 139163-56-7 1-(6-Bromo-2-pyridinyl)-1-ethanol MFCD12198456 (CAS 139163-56-7)
- 1-(3-Bromo-2-hydroxy-5-methylphenyl)butan-1-one (CAS 727687-84-5)
- 1-(6-Ethoxy-2-(methylthio)pyrimidin-4-yl)piperidin-3-amine hydrochloride (CAS 1353946-37-8)
- Pesticide Surrogate Solution (CAS CATO-LCEM500802-TH)
- (Z)-N'-Hydroxy-6-methoxy-5-(4-methyl-1H-imidazol-1-yl)picolinimidamide (CAS 2085782-91-6)
- 1-(2,6-Dichlorobenzyl)piperidin-4-amine hydrochloride (CAS 1261229-68-8)
- Liraglutide Sodium Salt (CAS 204656-20-2（free base）)
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