Famotidine Impurity C21 CAS 7120-01-6
| CAS No. | 7120-01-6 |
| Molecular Formula | C5H8N4S |
| Molecular Weight | 156.21 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Famotidine Impurity C21 is closely related to a nitrile group, sulfur-containing functionality in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
CATO supplies Famotidine Impurity C21 (CAS 7120-01-6), a pharmacopoeial impurity reference standard (molecular formula C5H8N4S, MW 156.21 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C5H8N4S, Famotidine Impurity C21 contains a nitrile group, sulfur-containing functionality; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 156.21 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
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.
CATO manufactures Famotidine Impurity C21 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 | C5H8N4S |
| Molecular Weight | 156.21 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1959 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
Related Famotidine Standards
- Famotidine impurity 66 (CAS 7259-54-3)
- Famotidine impurity 70 (CAS 874285-13-9)
- Famotidine Impurity 41 (CAS CATO-C4X-139241)
- Famotidine Impurity 57 (CAS 95853-46-6)
- Famotidine Impurity 81 (CAS CATO-C4X-139281)
- Famotidine Impurity 80 (CAS CATO-C4X-139280)
- Famotidine impurity 67 (CAS 77345-71-2)
- Famotidine Impurity C22 (CAS 86794-42-5)
Recommended Standards
- Dimethyl-1,3-thiazole-5-carboxamide (CAS 66806-33-5)
- N-(2-Methylthiazol-4-yl)acetamide (CAS 57372-19-7)
- 6-Methyl-2-(methylthio)pyrimidin-4-ol (CAS 20651-31-4)
- N-(2-Methylthiazol-5-yl)acetamide (CAS 6449-69-0)
- Benserazide Impurity 60 (CAS 13558-04-8(free base))
- Roxadustat Impurity 3 (CAS CATO-C4X-22133)
- Cefminox Impurity 14 (CAS 51138-06-8)
- 3-(3-Chloro-4-fluorobenzenesulfonyl)-6-methoxy-2H-chromen-2-one (CAS 866346-85-2)
- Relebactam Impurity 105 (CAS 2089462-48-4)
- 1-Chloro-5-methyl-4-nitro-2-(trifluoromethyl)benzene (CAS 873006-35-0)
- 1171976-97-8 4-(2-Thienyl)-5,6,8,9-tetrahydro-4H,7H-cyclopenta[4,5]thieno[3,2-f]pyrrolo[1,2-a][1,4]diazepine MFCD14282071 (CAS 1171976-97-8)
- 4-(Morpholinomethyl)benzimidamide hydrochloride (CAS 1221725-42-3)
- n-((3,5-Dimethylisoxazol-4-yl)methyl)-2-methylpentan-3-amine (CAS 1339186-96-7)
- Semaglutide impurity 257 (CAS CATO-C4X-2226257)
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