5-methyl-4-[(4-nitro-1H-pyrazol-1-yl)methyl]-1,2-oxazole-3-carboxylic acid CAS 956758-72-8
| CAS No. | 956758-72-8 |
| Molecular Formula | C9H8N4O5 |
| Molecular Weight | 252.18 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 5-methyl-4-[(4-nitro-1H-pyrazol-1-yl)methyl]-1,2-oxazole-3-carboxylic acid is closely related to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
5-methyl-4-[(4-nitro-1H-pyrazol-1-yl)methyl]-1,2-oxazole-3-carboxylic acid (CAS 956758-72-8), molecular formula C9H8N4O5 and molecular weight 252.18 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C9H8N4O5, 5-methyl-4-[(4-nitro-1H-pyrazol-1-yl)methyl]-1,2-oxazole-3-carboxylic acid contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 252.18 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 5-methyl-4-[(4-nitro-1H-pyrazol-1-yl)methyl]-1,2-oxazole-3-carboxylic acid 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.
Physical & Chemical Properties
| Molecular Formula | C9H8N4O5 |
| Molecular Weight | 252.18 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| 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.) | 1987 |
| Nitrogen Atoms | 4 |
Related methyl Standards
- 5-Methyl-4-[(3-nitro-1h-pyrazol-1-yl)methyl]-1,2-oxazole-3-carboxylic acid (CAS 1006951-15-0)
- 2-Methyl-7-nitro-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-2-carboxylic acid (CAS 154365-43-2)
- 2-Methyl-6-nitro-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-2-carboxylic acid (CAS 154365-44-3)
- 3-(6-Nitro-2-oxo-2,3-dihydro-1,3-benzoxazol-3-yl)propanoic acid (CAS 17124-57-1)
- 2-(6-Nitro-3-oxo-3,4-dihydro-2h-1,4-benzoxazin-4-yl)acetic acid (CAS 869464-86-8)
- Methyl 1-((3-nitro-1h-1,2,4-triazol-1-yl)methyl)-1h-pyrazole-3-carboxylate (CAS 1001499-88-2)
- 1-((3-Nitro-1h-1,2,4-triazol-1-yl)methyl)-1h-pyrazole-3-carbohydrazide (CAS 1001500-00-0)
- 3-Methyl-4-nitro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-5-carboxamide (CAS 89239-86-1)
Recommended Standards
- 4,4,5,5-Tetramethyl-2-(3,3a,4,6a-tetrahydro-1H-cyclopenta[c]thiophen-5-yl)-1,3,2-dioxaborolane (CAS 2417113-05-2)
- 6-Hydroxy-4-methoxy-7-nitrobenzofuran-5-carboxamide (CAS 88258-45-1)
- 4,4,5,5-Tetramethyl-2-(2,4,5-trimethylthiophen-3-yl)-1,3,2-dioxaborolane (CAS 2064117-97-9)
- Tretazicar (CAS 21919-05-1)
- 3-(4-(Difluoromethoxy)-2-nitrophenyl)propanoic acid (CAS 1805876-03-2)
- 3-(Carboxymethyl)pyridine 1-oxide (CAS 67445-83-4)
- 4,6-Dimethyl-3-phenyl-2H-chromen-2-one (CAS 112030-30-5)
- 4-Chloro-8-(trifluoromethyl)quinoline (CAS 23779-97-7)
- 4-(2,4-Dimethylphenoxy)benzoic acid (CAS 149190-98-7)
- N-hydroxy-4-sulfamoylbenzene-1-carboximidamide (CAS 4476-10-2)
- Formycin (CAS 6742-12-7)
- syn-1,2-Dihydro-1,2-naphthalenediol (CAS 31966-70-8)
- 4-bromo-3-(chloromethyl)-1-ethyl-1H-pyrazole (CAS 1392274-33-7)
- Semaglutide impurity 30 (CAS CATO-C4X-222630)
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