Anastrozole EP Impurity I CAS 120511-91-3
| CAS No. | 120511-91-3 |
| Molecular Formula | C15H17ClN2 |
| Molecular Weight | 260.76 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C15H17ClN2, Anastrozole EP Impurity I contains a nitrogen-containing heterocyclic scaffold, a nitrile group, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 260.76 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).
Anastrozole EP Impurity I (CAS 120511-91-3) is a certified pharmaceutical impurity reference standard with the molecular formula C15H17ClN2 and a molecular weight of 260.76 g/mol.
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.
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 | C15H17ClN2 |
| Molecular Weight | 260.76 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1991 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Anastrozole Standards
- Anastrozole Impurity 2 (CAS 120512-36-9)
- Anastrozole Impurity 38 (CAS CATO-C4X-123938)
- Anastrozole Impurity 12 (CAS 19294-04-3)
- Anastrozole EP Impurity E (CAS 120511-88-8)
- Anastrozole EP Impurity A (CAS 1215780-15-6)
- Anastrozole Impurity 32 (CAS CATO-C4X-123932)
- Anastrozole Impurity 18 (CAS 120511-89-9)
- Anastrozole Impurity 31 (CAS CATO-C4X-123931)
Recommended Standards
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- 2-(4-(Tert-butyl)phenyl)ethane-1-sulfonyl chloride (CAS 1017337-98-2)
- Bedaquiline Impurity 19 (CAS CATO-C4X-116719)
- Loratadine Impurity 25 (CAS CATO-C4X-142625)
- Propofol Impurity 17 (CAS 2934-07-8)
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- 5-(1-Methyl-3-propyl-1h-1,2,4-triazol-5-yl)thiophen-2-amine (CAS 1340323-87-6)
- Ethyl 5-bromo-7-fluoro-2-naphthoate (CAS 1956325-28-2)
- Liraglutide(5-31)TFA Salt (CAS CATO-C4X-19924)
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