Fluorouracil Impurity 3 CAS 4840-69-1
| CAS No. | 4840-69-1 |
| Molecular Formula | C5H5FN2O2 |
| Molecular Weight | 144.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C5H5FN2O2, Fluorouracil Impurity 3 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 144.10 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
CATO supplies Fluorouracil Impurity 3 (CAS 4840-69-1), a certified reference material (molecular formula C5H5FN2O2, MW 144.10 g/mol) for analytical method development and quality control.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
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 | C5H5FN2O2 |
| Molecular Weight | 144.10 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 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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1958 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Fluorouracil Standards
- 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)
- Fluorouracil Impurity 12 (CAS 155-16-8)
- Fluorouracil Impurity 26 (CAS 62836-98-0)
- Fluorouracil EP Impurity E (CAS 1820-81-1)
- Fluorouracil Impurity 11 (Mixture of Diastereomers) (CAS 37103-91-6)
Recommended Standards
- 6-Fluoro-5-methylpyrimidine-2,4(1H,3H)-dione (CAS 31458-36-3)
- Methyl 3-Fluorofuran-2-carboxylate (CAS 2115742-44-2)
- 4-Fluoro-5-methyl-1H-pyrazole-3-carboxylic acid (CAS 681034-58-2)
- methyl 4-fluorofuran-2-carboxylate (CAS 2117111-12-1)
- (2S,3R,4S,5R,6R)-6-(Hydroxymethyl)piperidine-2,3,4,5-tetraol (CAS 1932485-16-9)
- 2-Bromo-1-(5-chloro-4-fluoro-2-(trifluoromethyl)phenyl)ethan-1-one (CAS 1805956-11-9)
- Methyl 3-(2,3-dihydro-1H-pyrrolizin-5-yl)propanoate (CAS 61633-24-7)
- 1,3-Dimethyl-6-(methylamino)-2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbaldehyde (CAS 89549-92-8)
- 1,5-Dichloro-3-methoxy-2-nitrobenzene (CAS 74672-01-8)
- 4-Benzyl-1-piperazinecarboximidamide Hydrochloride (CAS 845616-58-2)
- 1-(Tert-butoxycarbonyl)-1-azaspiro[3.5]Nonane-7-carboxylic acid (CAS 2385828-29-3)
- 1-Methyl-4-(phenylamino)quinazolin-2(1H)-one (CAS 92554-69-3)
- 3-(4-Chloro-2-(trifluoromethyl)phenyl)propanoic acid (CAS 916420-46-7)
- Liraglutide Impurity 21 TFA Salt (CAS CATO-C4X-199221)
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