Flucloxacillin EP Impurity B (Mixture of Diastereomers) CAS 1276016-89-7
| CAS No. | 1276016-89-7 |
| Molecular Formula | C18H19ClFN3O4S |
| Molecular Weight | 427.88 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Flucloxacillin EP Impurity B (Mixture of Diastereomers) (CAS 1276016-89-7), a pharmacopoeial impurity reference standard (molecular formula C18H19ClFN3O4S, MW 427.88 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Flucloxacillin EP Impurity B (Mixture of Diastereomers) (C18H19ClFN3O4S) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, fluorine/chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 10.0, corresponding to approximately 10 ring(s) or double-bond equivalent(s). With a molecular weight of 427.88 g/mol, it falls into the moderately-high-molecular-weight range. 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 | C18H19ClFN3O4S |
| Molecular Weight | 427.88 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1990 |
| Halogen Content | F/Cl-containing |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related Flucloxacillin Standards
- Flucloxacillin EP Impurity B (CAS CATO-C4X-16472)
- Flucloxacillin - API Standards (CAS 5250-39-5)
- Flucloxacillin Monohydrate EP Impurity I (CAS CATO-C4X-164719)
- Flucloxacillin impurity 11 (CAS CATO-C4X-164711)
- Flucloxacillin impurity 8 (CAS CATO-C4X-16478)
- Flucloxacillin EP Impurity D Potassium salt (CAS 83817-49-6)
- Flucloxacillin EP Impurity A (CAS CATO-C4X-164715)
- Flucloxacillin Impurity 7 (CAS 42947-70-6)
Recommended Standards
- 1-(6-Chloropyridazin-3-yl)-4-(3,4-diethoxyphenyl)-3-methyl-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-b]pyridin-6-one (CAS 1144477-23-5)
- (4,5,6,7,8,8-Hexachloro-1,3-dioxo-1,3,3a,4,7,7a-hexahydro-2H-4,7-methanoisoindol-2-yl)acetic acid (CAS 60852-36-0)
- 3-((4-Chlorobenzyl)thio)-4-ethyl-5-((3-(trifluoromethyl)phenoxy)methyl)-4H-1,2,4-triazole (CAS 383146-70-1)
- 5-(4-Chlorophenyl)-3-hydroxy-4-(4-methoxybenzoyl)-1-((tetrahydrofuran-2-yl)methyl)-1H-pyrrol-2(5H)-one (CAS 496798-24-4)
- Hyoscine Butylbromide EP Impurity E (CAS 14861-14-4)
- Methylprednisolone impurity 82 (CAS 106502-98-1)
- Xanomeline Impurity 20 (CAS CATO-C4X-330120)
- (E)-N-Benzylidenebenzenesulfonamide (CAS 130552-90-8)
- 3-(4-Chlorophenyl)-5,6-dimethyl-2-sulfanylthieno[2,3-d]pyrimidin-4(3h)-one (CAS 126105-97-3)
- 2,4-Dimercaptobutanoic acid (CAS 126660-83-1)
- 1-(4-Butylphenyl)-3-((3-chloro-5-(trifluoromethyl)pyridin-2-yl)methyl)thiourea (CAS 326815-24-1)
- Isopulegolacetate (CAS 57576-09-7)
- Argatroban Impurity 65 (CAS CATO-C4X-100765)
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