Formoterol EP Impurity E CAS 1616967-26-0
| CAS No. | 1616967-26-0 |
| Molecular Formula | C20H26N2O4 |
| Molecular Weight | 358.43 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Formoterol EP Impurity E (CAS 1616967-26-0), a pharmacopoeial impurity reference standard (molecular formula C20H26N2O4, MW 358.43 g/mol) used for the identification and quantification of trace impurities in APIs.
Formoterol EP Impurity E (C20H26N2O4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, 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.
Physical & Chemical Properties
| Molecular Formula | C20H26N2O4 |
| Molecular Weight | 358.43 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1993 |
| Nitrogen Atoms | 2 |
Related Formoterol Standards
- Formoterol EP Impurity C (CAS 1795135-61-3)
- Formoterol EP Impurity D (CAS 1795133-96-8)
- Formoterol Impurity 89 (CAS CATO-C4X-152589)
- Formoterol Impurity 58 (CAS 725719-13-1)
- Formoterol Impurity 60 (CAS CATO-C4X-152560)
- Formoterol impurity 126 (CAS CATO-C4X-1525126)
- Formoterol impurity 127 (CAS 188690-82-6)
- Formoterol Impurity 54 (CAS 193761-53-4)
Recommended Standards
- Prednisone Impurity 7 (CAS CATO-C4X-16947)
- Beclomethasone dipropionate Impurity 31 (CAS CATO-C4X-147431)
- Prednisolone EP Impurity H (CAS 2427-64-7)
- Budesonide Impurity 74 (CAS CATO-C4X-138974)
- Levocetirizine Impurity 9 (CAS CATO-C4X-10839)
- Nimodipine Impurity 49 (CAS CATO-C4X-138549)
- Lacosamide EP Impurity K (CAS 86921-49-5)
- Telmisartan Impurity 93 (CAS CATO-C4X-135993)
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- Endo-Pro36-Tirzepatide (CAS CATO-CPTD788688)
Why CATO?
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