Formoterol Impurity 71 CAS 71250-20-9
| CAS No. | 71250-20-9 |
| Molecular Formula | C17H21NO |
| Molecular Weight | N/A |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Formoterol Impurity 71 (CAS 71250-20-9), a pharmacopoeial impurity reference standard (molecular formula C17H21NOHCl, MW 291.82 g/mol) used for the identification and quantification of trace impurities in APIs.
Formoterol Impurity 71 (C17H21NOHCl) contains a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. Halogen substitution raises its density and boiling point, its high carbon-to-hydrogen ratio confers good lipid solubility; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
CATO manufactures Formoterol Impurity 71 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 | C17H21NO HCl |
| Molecular Weight | 291.82 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| 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.) | 1977 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
Related Formoterol Standards
- Formoterol Impurity 69 (CAS 100865-09-6)
- Formoterol-d6(Mixture of Diastereomers) (CAS 1020719-45-2)
- Formoterol Impurity 22 HCl (CAS 1049695-95-5)
- Formoterol Impurity 72 (CAS 108971-53-5)
- Formoterol EP Impurity B (CAS 1224588-66-2)
- Formoterol Impurity 19 (CAS 126002-14-0)
- Formoterol Impurity 28 (CAS 126587-86-8)
- Formoterol (Mixture of Diastereomers) (CAS 128954-45-0)
Recommended Standards
- Cefminox Sodium Impurity 20 (CAS 57617-09-1)
- Solriamfetol Impurity 14 (CAS CATO-C4X-256314)
- Azelastine EP Impurity E (Z-Isomer) (CAS 105279-16-1)
- 6-bromo-1,2-dihydrospiro[indole-3,4'-piperidine]-2-one hydrochloride (CAS 1650548-73-4)
- 3-Bromo-5-((trifluoromethyl)thio)pyridin-2-amine (CAS 1383834-79-4)
- 3-(Methylsulfonyl)aniline hydrochloride (CAS 80213-28-1)
- (3-(Trifluoromethyl)pyrrolidin-3-yl)methanol (CAS 217096-40-7)
- 1,3-Bis(trifluoromethyl)-2-(difluoromethoxy)-5-ethylbenzene (CAS 1805084-35-8)
- tert-Butyl 3-isobutyrylpyrrolidine-1-carboxylate (CAS 1695673-11-0)
- Endo-Pro36-Tirzepatide (CAS CATO-CPTD788688)
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