Ulipristal Impurity 3 CAS 159681-66-0
| CAS No. | 159681-66-0 |
| Molecular Formula | C29H35NO4 |
| Molecular Weight | 461.59 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Ulipristal Impurity 3 is closely related to a steroid core, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
CATO supplies Ulipristal Impurity 3 (CAS 159681-66-0), a pharmacopoeial impurity reference standard (molecular formula C29H35NO4, MW 461.59 g/mol) used for the identification and quantification of trace impurities in APIs.
Ulipristal Impurity 3 (C29H35NO4) contains a steroid core, an amide group, a hydroxyl group, an ether linkage. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
As a certified reference material (CRM), Ulipristal Impurity 3 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 | C29H35NO4 |
| Molecular Weight | 461.59 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2002 |
| Nitrogen Atoms | 1 |
Related Ulipristal Standards
- Ulipristal Impurity 21 (CAS CATO-C4X-191521)
- Ulipristal Impurity 18 (CAS CATO-C4X-191518)
- Ulipristal Impurity 2 (CAS CATO-C4X-19152)
- Ulipristal Acetate (CAS 126784-99-4)
- Ulipristal Impurity 24 (CAS CATO-C4X-191524)
- Ulipristal Impurity 5 (CAS CATO-C4X-19155)
- Ulipristal Impurity 6 (CAS 1655514-74-1)
- Ulipristal Impurity 7 (CAS 709615-25-8)
Recommended Standards
- 5(S)-[1(S)-Azido-3(S)-[4-methoxy-3-(3-methoxypropoxy)benzyl]-4-methylpentyl]-3(S)-isopropyldihydrofuran-2-one (CAS 324763-46-4)
- 8-(2,3-Dihydro-1H-inden-2-yl)-1-isobutyl-3-(4-methoxybenzyl)-1,3,8-triazaspiro[4.5]decane-2,4-dione (CAS 1070445-78-1)
- 1-Benzyl-3-((trityloxy)methyl)piperidin-4-one (CAS 234757-27-8)
- 5-Cyano-N-(2-(4,4-dimethylcyclohex-1-en-1-yl)-6-(2,2,6,6-tetramethyltetrahydro-2H-pyran-4-yl)pyridin-3-yl)-1H-imidazole-2-carboxamide (CAS 1142363-52-7)
- Iodixanol impurity 20 (CAS 111453-49-7)
- Vildagliptin Impurity 97 (CAS CATO-C4X-110097)
- Carfilzomib Impurity 77 (CAS CATO-C4X-102277)
- 2-(4-Ethylphenyl)-2-(1H-indol-3-yl)ethan-1-amine (CAS 881043-63-6)
- Methyl 2-(5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-3(4H)-yl)acetate (CAS 403716-64-3)
- 1-(4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)piperazine (CAS 912369-50-7)
- (S)-6-(3-Methylpiperazin-1-yl)nicotinonitrile (CAS 1057682-03-7)
- Methyl 4-chloro-3-hydroxy-5-methylthiophene-2-carboxylate (CAS 113589-29-0)
- 4-Nitro-1H-pyrazole-3,5-dicarboxylic acid (CAS 62078-43-7)
- D-Ser32-Tirzepatide (CAS CATO-CPTD788677)
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