Fulvestrant impurity 47 CAS CATO-C4X-191747
| CAS No. | CATO-C4X-191747 |
| Molecular Formula | C29H41BrO4 |
| Molecular Weight | 533.54 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 Fulvestrant impurity 47.
Fulvestrant impurity 47 (CAS CATO-C4X-191747) is a certified pharmaceutical impurity reference standard with the molecular formula C29H41BrO4 and a molecular weight of 533.54 g/mol.
Based on its molecular formula C29H41BrO4, Fulvestrant impurity 47 contains a steroid core, a hydroxyl group, an ether linkage, bromine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 533.54 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
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.
Physical & Chemical Properties
| Molecular Formula | C29H41BrO4 |
| Molecular Weight | 533.54 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at room temperature, 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Br-containing |
Related Fulvestrant Standards
- Fulvestrant Impurity 18 (CAS CATO-C4X-191718)
- Fulvestrant Impurity 20 (CAS CATO-C4X-191720)
- Fulvestrant impurity 39 (CAS CATO-C4X-191739)
- Fulvestrant impurity 49 (CAS CATO-C4X-191749)
- Fulvestrant impurity 50 (CAS CATO-C4X-191750)
- Fulvestrant impurity 51 (CAS CATO-C4X-191751)
- Fulvestrant impurity 56 (CAS CATO-C4X-191756)
- Fulvestrant impurity 40 (CAS CATO-C4X-191740)
Recommended Standards
- Rimegepant Impurity 144 (CAS CATO-C4X-2487144)
- Relugolix Impurity 19 (CAS 2591260-09-0)
- Rimegepant Impurity 141 (CAS CATO-C4X-2487141)
- Ac-dmqd-cho (CAS 259199-63-8)
- Celecoxib Impurity 37 (CAS 326-06-7)
- Epinastine Impurity N5 (CAS 21535-44-4)
- Calcium Dobesilate impurity 20 (CAS CATO-C4X-205120)
- 2-(1,1-Dioxido-4-(prop-2-yn-1-yl)thiomorpholin-3-yl)acetic acid hydrochloride (CAS 1864013-96-6)
- 3-(4,6-Dimethyl-2-oxopyrimidin-1(2h)-yl)propanoic acid (CAS 764642-23-1)
- 6-Phenylpiperidine-2,4-dione (CAS 118264-04-3)
- 1-(1H-Benzo[d][1,2,3]triazol-6-yl)ethanone (CAS 146519-40-6)
- 2-(5-Methyl-1,2,4-oxadiazol-3-yl)isonicotinic acid (CAS 859155-80-9)
- 2-Phenoxy-N-(1h-pyrazol-4-yl)propanamide (CAS 1157111-92-6)
- Lixisenatide (CAS 320367-13-3（free base）)
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