Ethinylestradiol EP Impurity G CAS 38002-18-5
| CAS No. | 38002-18-5 |
| Molecular Formula | C20H22O3 |
| Molecular Weight | 310.39 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 310.39 g/mol gives Ethinylestradiol EP Impurity G distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Ethinylestradiol EP Impurity G (CAS 38002-18-5) is a certified pharmaceutical impurity reference standard with the molecular formula C20H22O3 and a molecular weight of 310.39 g/mol.
Owing to a steroid core, a hydroxyl group, an ether linkage, Ethinylestradiol EP Impurity G is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 310.39 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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 | C20H22O3 |
| Molecular Weight | 310.39 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 chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1967 |
Related Ethinylestradiol Standards
- Ethinylestradiol EP Impurity H (CAS 1350468-76-6)
- Ethinylestradiol 1-Hydroxy 4-Methyl Impurity (CAS 1034298-00-4)
- Ethinylestradiol EP Impurity J (CAS 15071-66-6)
- Ethinylestradiol EP Impurity K (CAS 155683-61-7)
- Ethinylestradiol EP Impurity M (CAS 3240-39-9)
- Ethinylestradiol EP Impurity F (CAS 56324-28-8)
- Ethinylestradiol EP Impurity E (6-alpha-Hydroxy Ethynylestradiol) (CAS 27521-34-2)
- Ethinylestradiol 2-Hydroxy Impurity (CAS 50394-89-3)
Recommended Standards
- Praziquantel Impurity 5 (CAS 79848-92-3)
- Praziquantel EP Impurity B (CAS 125273-86-1)
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