Finasteride EP Impurity B CAS 103335-41-7
Purity >95%In StockPharmacopoeial Impurity Standards
| 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
CATO supplies Finasteride EP Impurity B (CAS 103335-41-7), a pharmacopoeial impurity standards reference standard manufactured under ISO 17034 accreditation. Molecular formula: C20H29NO3. Molecular weight: 331.45 g/mol. Batch-specific COA and technical support are available on request.
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
- Penehyclidine Impurity 6 (Mixture of Diastereomers) (CAS 2564756-90-5)
- CAS 101846-86-0 (CAS 101846-86-0)
- Nateglinide Impurity 8 (CAS 105746-47-2)
- Sitafloxacin impurity 57 (CAS CATO-C4X-115557)
- Proparacaine Impurity 5 DiHCl (CAS 2731368-99-1)
- 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)
- 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 13829788188 / jacky.chen@cato-chem.com