Sulfadimethoxine EP Impurity A CAS 3289-50-7
| CAS No. | 3289-50-7 |
| Molecular Formula | C6H9N3O2 |
| Molecular Weight | 155.15 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C6H9N3O2, Sulfadimethoxine EP Impurity A contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 155.15 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 Sulfadimethoxine EP Impurity A (CAS 3289-50-7), a pharmacopoeial impurity reference standard (molecular formula C6H9N3O2, MW 155.15 g/mol) used for the identification and quantification of trace impurities in APIs.
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.
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 | C6H9N3O2 |
| Molecular Weight | 155.15 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°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 |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 3 |
Related Sulfadimethoxine Standards
- Sulfadimethoxine Impurity 19 (CAS CATO-C4X-150419)
- Sulfadimethoxine Impurity (CAS 80314-58-5)
- Sulfadimethoxine EP Impurity E (CAS 63-74-1)
- Sulfadimethoxine EP Impurity D (CAS 121-57-3)
- Sulfadimethoxine Impurity 20 (CAS CATO-C4X-150420)
- Sulfadimethoxine Impurity (CAS 69943-39-1)
- Sulfadimethoxine Impurity (CAS 69943-38-0)
- Sulfadimethoxine EP Impurity C (CAS 121-62-0)
Recommended Standards
- Allopurinol EP Impurity D (CAS 6994-25-8)
- Doxofylline Impurity 24 (CAS 17743-04-3)
- Famotidine impurity 66 (CAS 7259-54-3)
- Doxofylline Impurity 25 (CAS 6642-31-5)
- Piperazine Impurity 12 (CAS 93190-30-8)
- Ertapenem Impurity 29 (CAS 1150883-75-2)
- Gliquidone Impurity 4 (CAS 191988-38-2)
- (Z)-2-((4-chlorophenyl)thio)-N'-hydroxynicotinimidamide (CAS 886360-64-1)
- 1,2,5-Trimethyl-4-phenyl-1H-pyrazol-3(2H)-one (CAS 79994-65-3)
- 2-((2,4-Dichlorobenzyl)(methyl)amino)ethanol (CAS 1250137-33-7)
- 2-Chloro-1-[4-(2-hydroxyphenyl)piperazin-1-yl]propan-1-one (CAS 1178761-97-1)
- 10-(4-Methoxyphenyl)-10H-phenothiazine (CAS 58736-69-9)
- cis-3-(trifluoromethoxy)cyclobutyl)methanol (CAS 2278284-98-1)
- [D-Phe22]Semaglutide (CAS CATO-C4X-2226222)
Why CATO?
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