Benzenesulfonic Impurity 4 CAS 55034-26-9
| CAS No. | 55034-26-9 |
| Molecular Formula | C7H9NO3S |
| Molecular Weight | 187.22 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Benzenesulfonic Impurity 4 (C7H9NO3S) contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. 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).
As a process- or degradation-related impurity, Benzenesulfonic Impurity 4 (CAS 55034-26-9, C7H9NO3S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
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 | C7H9NO3S |
| Molecular Weight | 187.22 g/mol |
| Purity | >95% |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1972 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Benzenesulfonic Standards
- 25321-41-9 Benzenesulfonic acid, dimethyl- Dimethylbenzenesulfonic acid Xylene sulfonic acid Xylenesulphonic acid EINECS 246-839-8 Xylenesulfonic acid EC 246-839-8 (CAS 25321-41-9)
- Benzenesulfonic acid, 2-propenyl ester (CAS 7575-57-7)
- Benzenesulfonic acid, 4-methyl-, ethenyl ester (CAS 83813-73-4)
- Benzenesulfonic Acid Impurity 5 (CAS 249285-50-5)
- Benzenesulfonic acid, diethenyl-, homopolymer (CAS 65405-46-1)
- Benzenesulfonic Acid Impurity 11 (CAS 24698-43-9)
- Benzenesulfonic acid, (acetylamino)- (CAS 138721-63-8)
- Benzenesulfonic Acid (CAS 98-11-3)
Recommended Standards
- Timolol EP Impurity D (CAS 30165-97-0)
- Dotinurad Impurity 171 (CAS 50910-59-3)
- Celecoxib Impurity 45 (CAS 90824-33-2)
- Dotinurad Impurity 188 (CAS CATO-C4X-2494188)
- Letermovir Impurity 65 (CAS CATO-C4X-291565)
- Clopidogrel Impurity 82 (CAS 1015247-87-6)
- Zopiclone Impurity 19 (CAS CATO-C4X-123819)
- Methyl 2-[(6-bromonaphthalen-2-yl)oxy]acetate (CAS 270081-83-9)
- 786578-60-7 N-[Amino(imino)methyl]-4-phenylpiperazine-1-carboximidamide MFCD15203589 (CAS 786578-60-7)
- tert-Butyl 3,4,6,7-tetrahydro-5H-[1,2,3]triazolo[4,5-c]pyridine-5-carboxylate (CAS 1251016-63-3)
- tert-Butyl 3-(aminomethyl)-2-methylpyrrolidine-1-carboxylate (CAS 1554651-31-8)
- 5’-O-Triphenylmethyl-2’-deoxyuridine (CAS 14270-73-6)
- 2-Amino-6-(tert-butyl)-N-(4-ethylphenyl)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (CAS 588714-57-2)
- Semaglutide Impurity 151 xTFA (CAS CATO-C4X-2226151)
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