Fluorouracil Impurity 11 (Mixture of Diastereomers) CAS 37103-91-6
| CAS No. | 37103-91-6 |
| Molecular Formula | C4H5FN2O3 |
| Molecular Weight | 148.09 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures Fluorouracil Impurity 11 (Mixture of Diastereomers) 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.
CATO supplies Fluorouracil Impurity 11 (Mixture of Diastereomers) (CAS 37103-91-6), a pharmacopoeial impurity reference standard (molecular formula C4H5FN2O3, MW 148.09 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C4H5FN2O3, Fluorouracil Impurity 11 (Mixture of Diastereomers) contains an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, fluorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 148.09 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.
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.
Physical & Chemical Properties
| Molecular Formula | C4H5FN2O3 |
| Molecular Weight | 148.09 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1967 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Fluorouracil Standards
- Fluorouracil EP Impurity E (CAS 1820-81-1)
- Fluorouracil Impurity 26 (CAS 62836-98-0)
- Fluorouracil Impurity 12 (CAS 155-16-8)
- Fluorouracil Impurity 3 (CAS 4840-69-1)
- Fluorouracil Impurity 10 (CAS 1480-96-2)
- Fluorouracil EP Impurity D (CAS 6623-81-0)
- Fluorouracil Impurity 22 (CAS CATO-C4X-164922)
- Fluorouracil Impurity 30 (CAS CATO-C4X-164930)
Recommended Standards
- 3,5,6-Trifluoropyridin-2-amine (CAS 3534-50-7)
- 5-Fluoropyrimidine-2,4-dicarbonitrile (CAS 1208813-28-8)
- 3,4,6-Trifluoropyridin-2-amine (CAS 63489-59-8)
- (E)-3-(Dimethylphosphoryl)acrylic acid (CAS 2920074-81-1)
- Trazodone Impurity 86 (CAS CATO-C4X-177286)
- Fezolinetant Impurity 21 (CAS CATO-C4X-327021)
- Nicotinamide Impurity 2 (CAS 606-68-8)
- 3-(5-Cyclopentyl-1,3,4-oxadiazol-2-yl)propanoic acid (CAS 1183501-62-3)
- 2-But-3-ynyl-oxirane (CAS 125455-85-8)
- 1-Chloro-4-[1-(4-Chlorophenyl)-2,2,2-Trifluoroethyl]Benzene (CAS 361-07-9)
- tert-Butyl ((5-hydroxypyridin-2-yl)methyl)carbamate (CAS 1240620-37-4)
- Pentafluoroallyl fluorosulfate (CAS 67641-28-5)
- 5-Phenyl-3a,4,7,7a-tetrahydroisobenzofuran-1,3-dione (CAS 6337-27-5)
- Insulin Degludec Impurity 15 (CAS CATO-C4X-215715)
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