Probenecid EP Impurity A CAS 636-78-2
| CAS No. | 636-78-2 |
| Molecular Formula | C7H6O5S |
| Molecular Weight | 202.18 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures Probenecid EP Impurity A under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
CATO supplies Probenecid EP Impurity A (CAS 636-78-2), a pharmacopoeial impurity reference standard (molecular formula C7H6O5S, MW 202.18 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Probenecid EP Impurity A (C7H6O5S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 5.0, corresponding to approximately 5 ring(s) or double-bond equivalent(s). With a molecular weight of 202.18 g/mol, it falls into the medium-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C7H6O5S |
| Molecular Weight | 202.18 g/mol |
| Purity | >95% |
| Storage | Store in a cool place (≤25°C), keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Sulfur Atoms | 1 |
Related Probenecid Standards
- Probenecid Impurity 4 (CAS 126865-08-5)
- Probenecid Impurity 4 (CAS 1206-37-7)
- Probenecid EP Impurity B (CAS 723-42-2)
- Probenecid Impurity 10 (CAS 141284-79-9)
- Probenecid (CAS 57-66-9)
- Probenecid Impurity 9 (CAS 141284-78-8)
- Probenecid EP Impurity D (CAS 70190-76-0)
- Probenecid Isopropyl Ester (CAS 70190-78-2)
Recommended Standards
- Arotinolol Impurity 48 (CAS CATO-C4X-185448)
- 3-fluoro-4-(1H-1,2,4-triazol-1-ylmethyl)benzonitrile (CAS 1016753-56-2)
- Meloxicam Impurity 7 (CAS 632-25-7)
- 2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-(methoxyimino)acetic acid (CAS 102297-34-7)
- Irinotecan Impurity 63 (CAS CATO-C4X-166763)
- Clindamycin EP Impurity B (CAS 18323-43-8)
- Rifaximin EP Impurity B (CAS 13929-35-6)
- N,N-dimethyl-1-(1-methylpiperidin-4-yl)methanamine dihydrochloride (CAS 1170171-39-7)
- 4645-32-3 Dimethyl vinylphosphonate Vinylphosphonic acid diMethyl ester, Min. 90% (CAS 4645-32-3)
- 6-Amino-5-(difluoromethyl)-4-methoxypyridin-3-ol (CAS 1805079-80-4)
- 3-Oxo-2-((tetrahydrofuran-2-yl)methyl)indoline-4-carboxylic acid (CAS 728024-54-2)
- N-Nitroso-4-piperidone (CAS 55556-91-7)
- Ethyl 2-bromo-5-(bromomethyl)benzoate (CAS 1261483-52-6)
- Peptide 433 (CAS CATO-CPTD788433)
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