Ulipristal Impurity 1 CAS 159681-67-1
| CAS No. | 159681-67-1 |
| Molecular Formula | C27H33NO3 |
| Molecular Weight | 419.56 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, Ulipristal Impurity 1 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 419.56 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
CATO supplies Ulipristal Impurity 1 (CAS 159681-67-1), a pharmacopoeial impurity reference standard (molecular formula C27H33NO3, MW 419.56 g/mol) used for the identification and quantification of trace impurities in APIs.
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.
CATO manufactures Ulipristal Impurity 1 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C27H33NO3 |
| Molecular Weight | 419.56 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 chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2002 |
| Nitrogen Atoms | 1 |
Related Ulipristal Standards
- Ulipristal Impurity 13 (CAS CATO-C4X-191513)
- Ulipristal Impurity 16 (CAS 159811-51-5)
- Ulipristal Impurity 4 (CAS 244206-52-8)
- Ulipristal Impurity 27 (CAS 1655514-79-6)
- Ulipristal Impurity 31 (CAS 54201-84-2)
- Ulipristal D3 (CAS CATO-C4X-191535)
- Ulipristal Impurity 9 (CAS CATO-C4X-19159)
- Ulipristal Impurity 19 (CAS CATO-C4X-191519)
Recommended Standards
- Terbutaline impurity 104 (CAS CATO-C4X-1183104)
- N1-(Pyridin-4-ylmethyl)-N2,N2-bis(2-((pyridin-4-ylmethyl)amino)ethyl)ethane-1,2-diamine (CAS 1370518-24-3)
- Salbutamol impurity 90 (CAS 35459-09-7)
- AZD 4017 1024033-43-9 3-Piperidineacetic acid, 1-[5-[(cyclohexylamino)carbonyl]-6-(propylthio)-2-pyridinyl]-, (3S)-;3-Piperidineacetic acid, 1-[5-[(cyclohexylamino)carbonyl]-6-(propylthio)-2-pyridinyl]-, (3S)- (CAS 1024033-43-9)
- Montelukast Impurity N3 (CAS 880769-28-8)
- Azilsartan Impurity 63 (CAS 985638-55-8)
- Prucalopride Impurity 40（DP-3） (CAS 1900715-94-7)
- 4-Nitro-N-(4-(4-pentylcyclohexyl)phenyl)benzamide (CAS 477890-27-0)
- Methyl 4-chloro-5-methoxy-2-nitrobenzoate (CAS 1823517-66-3)
- N-(But-3-enyloxy)benzamide (CAS 114778-53-9)
- 3-(Methoxymethyl)-1-benzothiophene-2-carboxylic acid (CAS 1094424-69-7)
- ((3aR,5R,6S,6aR)-6-Hydroxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)methyl benzoate (CAS 6022-96-4)
- 7-Hydroxy-2H-benzo[b][1,4]oxazin-3(4H)-one (CAS 67193-97-9)
- Des-Pro36-37-Tirzepatide (CAS CATO-CPTD788938)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com