4-Amino-5-(methylthio)-1H-pyrazole-3-carboxamide CAS 28668-18-0
| CAS No. | 28668-18-0 |
| Molecular Formula | C5H8N4OS |
| Molecular Weight | 172.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 4-Amino-5-(methylthio)-1H-pyrazole-3-carboxamide meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
4-Amino-5-(methylthio)-1H-pyrazole-3-carboxamide (CAS 28668-18-0), molecular formula C5H8N4OS and molecular weight 172.21 g/mol, is a CATO reference standard with documented purity and traceability.
4-Amino-5-(methylthio)-1H-pyrazole-3-carboxamide (C5H8N4OS) contains an amide group, sulfur-containing functionality, a hydroxyl group, an ether linkage. Its physicochemical properties are representative of its class; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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 is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
Physical & Chemical Properties
| Molecular Formula | C5H8N4OS |
| Molecular Weight | 172.21 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.) | 1965 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
Related Amino Standards
- 2-Amino-N-(5-methyl-1,3,4-thiadiazol-2-yl)acetamide (CAS 1175844-13-9)
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- 2-Amino-5-methylthiazole-4-carbohydrazide (CAS 1379308-65-2)
- 4-Amino-6-methyl-3-(methylthio)-1,2,4-triazin-5(4H)-one (CAS 18826-96-5)
- 2-(2-Amino-1,3-thiazol-4-yl)acetohydrazide (CAS 63788-65-8)
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Recommended Standards
- 3-(3-Mercapto-1H-1,2,4-triazol-5-yl)propanamide (CAS 522644-34-4)
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- 5,6-Diamino-1-methyl-2-sulfanylidene-1,2,3,4-tetrahydropyrimidin-4-one (CAS 875-41-2)
- 2-(3-Methyl-5-sulfanyl-4h-1,2,4-triazol-4-yl)acetamide (CAS 42047-30-3)
- (E)-3-(5-Morpholin-4-yl-2-nitro-phenyl)-acrylic acid (CAS 158726-95-5)
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- 3-(3,5-Dibromophenyl)-1-methylpyrrolidine-2,5-dione (CAS 81199-24-8)
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