Torasemide EP Impurity B CAS 72811-73-5
| CAS No. | 72811-73-5 |
| Molecular Formula | C12H13N3O2S |
| Molecular Weight | 263.32 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Torasemide EP Impurity B.
CATO supplies Torasemide EP Impurity B (CAS 72811-73-5), a pharmacopoeial impurity reference standard (molecular formula C12H13N3O2S, MW 263.32 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Torasemide EP Impurity B (C12H13N3O2S) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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.
CATO manufactures Torasemide EP Impurity B 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.
Physical & Chemical Properties
| Molecular Formula | C12H13N3O2S |
| Molecular Weight | 263.32 g/mol |
| Purity | >95% |
| 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1977 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related Torasemide Standards
- Torasemide Impurity 26 (CAS CATO-C4X-183626)
- Torasemide Impurity 27 (CAS CATO-C4X-183627)
- Torasemide Impurity 14 (CAS 947327-54-0)
- Torasemide Impurity 47 (CAS 204499-30-9)
- Torasemide Impurity 8 (CAS 69300-04-5)
- Torasemide impurity 38 (CAS CATO-C4X-183638)
- Torasemide impurity 31 (CAS CATO-C4X-183631)
- Torasemide impurity 32 (CAS CATO-C4X-183632)
Recommended Standards
- 59851-26-2 Phenanthro(9,10-e)-1,2,4-triazine-3(2H)-thione 3-Mercaptophenanthreno(9,10-e)-1,2,4-triazine (CAS 59851-26-2)
- Sumatriptan cyanomethyl impurity, 98% (CAS 88918-76-7)
- N'-hydroxy-4-((2-methylthiazol-4-yl)methoxy)benzimidamide (CAS 306935-19-3)
- H-Gly-Gly-Met-OH (CAS 17343-02-1)
- Oxiracetam Impurity 14 (CAS 24587-49-3)
- Cladribine EP Impurity B (CAS 24757-70-8)
- Dequalinium Impurity 10 (CAS CATO-C4X-193610)
- (S)-3-Amino-6-(tert-butoxy)-6-oxohexanoic Acid (CAS 1275612-13-9)
- Sotalol EP Impurity A (CAS 16974-42-8)
- 3-(8-Methoxy-6-methyl-4-oxoquinolin-1(4H)-yl)propanoic acid (CAS 1315371-14-2)
- 1-(4-(2-Hydroxy-2-methylpropyl)piperazin-1-yl)-2-methoxyethan-1-one (CAS 1311970-42-9)
- 1-Chloro-3-isopropoxy-5-methylbenzene (CAS 1369862-96-3)
- Atomoxetine Impurity 45 (CAS CATO-C4X-155045)
- Semaglutide Impurity 176 (CAS CATO-C4X-2226176)
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