Cefixime Impurity C68 CAS 74440-05-4
| CAS No. | 74440-05-4 |
| Molecular Formula | C7H7N3O5S |
| Molecular Weight | 245.21 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Cefixime Impurity C68 (CAS 74440-05-4) is a certified pharmaceutical impurity reference standard with the molecular formula C7H7N3O5S and a molecular weight of 245.21 g/mol.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system, Cefixime Impurity C68 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 245.21 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
Physical & Chemical Properties
| Molecular Formula | C7H7N3O5S |
| Molecular Weight | 245.21 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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 |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1978 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related Cefixime Standards
- Cefixime Impurity 15 (CAS 84080-70-6)
- Cefixime Impurity 83 (CAS CATO-C4X-113983)
- Cefixime Impurity 78 (CAS CATO-C4X-113978)
- Cefixime Impurity 9 (CAS 80544-17-8)
- Cefixime Impurity C17 (CAS 84080-68-2)
- Cefixime Impurity 44 (CAS CATO-C4X-113944)
- Cefixime Impurity 99 (CAS CATO-C4X-113999)
- Cefixime Impurity 73 (CAS CATO-C4X-121073)
Recommended Standards
- N-(4-cyano-3-methylisoxazol-5-yl)-4-fluorobenzamide (CAS 478033-14-6)
- 4-Amino-1-[(2R,3R,4R,5R)-3-fluoro-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one (CAS 10212-20-1)
- Ethyl [(5-nitro-1,3-thiazol-2-yl)amino](oxo)acetate (CAS 89792-36-9)
- Capecitabine EP Impurity A (CAS 66335-38-4)
- Dienogest EP Impurity C (CAS 106111-42-6)
- Fluconazole Impurity 70 (CAS 70890-80-1)
- Voriconazole EP Impurity E(Voriconazole Related Compound F) (CAS 5872-08-2)
- Diethylether (CAS 60-29-7)
- (2-(6-(Dimethylamino)-5-methylpyridin-3-yl)pyrrolidin-1-yl)(phenyl)methanone (CAS 1352539-07-1)
- 6-Methylheptanol (CAS 1653-40-3)
- N-(4-Amino-6,7-dimethoxyquinazol-2-yl)-N-(methyl-d3)-2-cyanoethylamine (CAS 1185144-54-0)
- Econazole impurity 28 (CAS 56719-70-1)
- (3,4-Dichloropyridin-2-yl)methanol (CAS 103949-59-3)
- Neuroendocrine Regulatory Peptide-1 (human) (H-6622.1000) (CAS 954420-50-9)
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