Cefprozil EP Impurity K-Isomer 1 CAS CATO-C4X-149216
| CAS No. | CATO-C4X-149216 |
| Molecular Formula | C18H19N3O5S |
| Molecular Weight | 389.43 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Cefprozil EP Impurity K-Isomer 1 is closely related to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
Cefprozil EP Impurity K-Isomer 1 (CAS CATO-C4X-149216) is a certified pharmaceutical impurity reference standard with the molecular formula C18H19N3O5S and a molecular weight of 389.43 g/mol.
Cefprozil EP Impurity K-Isomer 1 (C18H19N3O5S) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C18H19N3O5S |
| Molecular Weight | 389.43 g/mol |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related Cefprozil Standards
- Cefprozil Impurity N1(Z-Cefprozil) (CAS 121412-77-9)
- Cefprozil (CAS 92665-29-7)
- Cefprozil Δ3 Isomer (CAS 1000980-59-5)
- Cefprozil (E)-Isomer (CAS 92676-86-3)
- Cefprozil EP Impurity K-Isomer 2 (CAS CATO-C4X-149222)
- Cefprozil EP Impurity K-Isomer 3 (CAS CATO-C4X-149223)
- Cefprozil EP Impurity K-Isomer 4 (CAS CATO-C4X-149224)
- Cefprozil EP Impurity K Mixture(Isomer 1,2,3,4) (CAS CATO-C4X-149226)
Recommended Standards
- Tert-butyl (R)-3-(2-((4,4,4-trifluorobutyl)sulfonyl)ethyl)morpholine-4-carboxylate (CAS 2306246-54-6)
- n-(5-Amino-4-(benzo[d]thiazol-2-yl)-3-oxo-2,3-dihydro-1h-pyrrol-1-yl)-1h-indole-3-carboxamide (CAS 380561-38-6)
- n-(4-Methoxyphenyl)-5-(morpholine-4-sulfonyl)-1,3-benzoxazol-2-amine (CAS 730949-76-5)
- Methyl 3-[4-([1,1-biphenyl]-4-ylcarbonyl)-1H-1,2,3-triazol-1-yl]-2-thiophenecarboxylate (CAS 439111-70-3)
- Bupropion Impurity 14 (CAS CATO-C4X-120314)
- Venetoclax Impurity 56 (CAS CATO-C4X-249556)
- Sotorasib impurity 1 (CAS CATO-C4X-31031)
- Methyl 2-hydroxy-5,6,7,8-tetrahydronaphthalene-1-carboxylate (CAS 59604-96-5)
- 1,1-Diethyl-2-hydroxyguanidine (CAS 54207-44-2)
- Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-hydro-.omega.-hydroxy-, ether with methyl D-glucopyranoside (CAS 52673-60-6)
- Avibactam Impurity 56（2S,5R) (CAS 1192651-49-2)
- 3-Benzothiazol-2-yl-4-(4-methoxy-phenyl)-but-3-enoic acid (CAS 748786-57-4)
- 6-Chloro-N-(piperidin-3-yl)pyrimidin-4-amine hydrochloride (CAS 1185309-48-1)
- [D-His1]-Semaglutide (CAS CATO-C4X-2226127)
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