Citalopram Impurity 21 CAS 1433278-32-0
| CAS No. | 1433278-32-0 |
| Molecular Formula | C25H35FN2O3 |
| Molecular Weight | 430.56 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Citalopram Impurity 21 (CAS 1433278-32-0) is a certified pharmaceutical impurity reference standard with the molecular formula C25H35FN2O3 and a molecular weight of 430.56 g/mol.
Based on its molecular formula C25H35FN2O3, Citalopram Impurity 21 contains a steroid core, an amide group, a hydroxyl group, an ether linkage, fluorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 430.56 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
As a certified reference material (CRM), Citalopram Impurity 21 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C25H35FN2O3 |
| Molecular Weight | 430.56 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | >95% |
| Storage | Store in a cool place (≤25°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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1991 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Citalopram Standards
- Citalopram Impurity 83 (CAS CATO-C4X-110983)
- Citalopram Impurity 54 (CAS CATO-C4X-110954)
- Citalopram Impurity 95 (CAS CATO-C4X-110995)
- Citalopram Impurity 96 (CAS CATO-C4X-110996)
- Citalopram EP Impurity G (CAS 1329745-98-3)
- Citalopram Impurity 92 (CAS 1803244-58-7)
- Citalopram Impurity 23 (CAS 390817-87-5)
- Citalopram EP Impurity F (CAS 64169-39-7)
Recommended Standards
- Methyl 2-(4-(tert-butyl)benzamido)-5-(diethylcarbamoyl)-4-methylthiophene-3-carboxylate (CAS 424809-80-3)
- Orforglipron impurity 126 (CAS CATO-C4X-3234126)
- 3-[2-(3,4-dimethoxyphenyl)ethyl]-2-sulfanyl-5-(thiophen-2-yl)-3h,4h-thieno[2,3-d]pyrimidin-4-one (CAS 743452-31-5)
- Fluorescent Brightener 184 (CAS 7128-64-5)
- Tivozanib Impurity 17 (CAS CATO-C4X-340017)
- Rosuvastatin Impurity 68 (CAS CATO-C4X-116968)
- Aripiprazole Impurity 82 (CAS CATO-C4X-100882)
- 6-Chloro-N-(3-morpholinopropyl)pyridazin-3-amine (CAS 838089-53-5)
- 2-Propoxy-4-(trifluoromethyl)phenylboronic acid (CAS 2377611-21-5)
- 1,4,4-Trimethylpyrazolidin-3-one (CAS 500690-22-2)
- 2-Propene-1-sulfonic Acid (CAS 1606-80-0)
- 1-(m-Tolyl)-3-azabicyclo[3.1.0]hexane (CAS 86215-39-6)
- 4-Ethoxyphenyl trans-4-butylcyclohexanoate (CAS 67589-47-3)
- Cholecystokinin Octapeptide (desulfated) (H-2070.0005) (CAS 198483-36-2)
Why CATO?
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