2H-Isoxazolo[5,4-b]pyrazolo[4,3-e]pyridine CAS 404345-61-5
| CAS No. | 404345-61-5 |
| Molecular Formula | C7H4N4O |
| Molecular Weight | 160.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
2H-Isoxazolo[5,4-b]pyrazolo[4,3-e]pyridine (CAS 404345-61-5), molecular formula C7H4N4O and molecular weight 160.13 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amide group, a hydroxyl group, an ether linkage, an aromatic ring system, 2H-Isoxazolo[5,4-b]pyrazolo[4,3-e]pyridine is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 160.13 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C7H4N4O |
| Molecular Weight | 160.13 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (faint amine-like odor) |
| 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Nitrogen Atoms | 4 |
Related H Standards
- 2H-Isoxazolo[5,4-d]pyrazolo[3,4-b]pyridine (CAS 106990-55-0)
- 1H-Isoxazolo[3,4-d]pyrazolo[3,4-b]pyridine (CAS 107457-74-9)
- Isoxazolo[4,3-e]pyrazolo[1,5-a]pyrimidine (CAS 149626-22-2)
- 2H-Isoxazolo[5,4-d]azonine (CAS 154099-32-8)
- Isoxazolo[4',5':3,4]benzo[1,2-c][1,2,5]oxadiazole (CAS 126877-68-7)
- Isoxazolo[5',4':3,4]benzo[1,2-c][1,2,5]oxadiazole (CAS 133818-22-1)
- 1H-Isoxazolo[5,4-g]indazole (CAS 173894-82-1)
- 2H-Isoxazolo[5,4-b]pyrrolo[2,3-e]pyridine (CAS 952702-87-3)
Recommended Standards
- 2H-Imidazo[4,5-d]oxazolo[5,4-b]pyridine (CAS 807364-33-6)
- 2-Oxo-2,3-dihydro-1,3-benzoxazole-5-carbonitrile (CAS 201531-21-7)
- 2H-Imidazo[4,5-d]oxazolo[4,5-b]pyridine (CAS 807364-32-5)
- 2-oxo-2,3-dihydrobenzo[d]oxazole-6-carbonitrile (CAS 98556-62-8)
- 2-(2-Fluoro-5-nitrophenyl)-3a,4,7,7a-tetrahydro-1H-4,7-methanoisoindole-1,3(2H)-dione (CAS 342412-84-4)
- 2-(3,5,7-Trimethyladamantan-1-yl)acetic acid (CAS 14201-93-5)
- 3,6-Bis(benzyloxy)pyridazine (CAS 4603-62-7)
- [1,2,4]Triazolo[4,3-a]pyridine-3-carboxamide (CAS 4919-09-9)
- Lubiprostone Impurity 23 (CAS CATO-C4X-113623)
- 7-Chloroisoquinolin-8-amine (CAS 55766-90-0)
- Pyridine-3,4-dicarboxamide (CAS 4663-98-3)
- 2-Bromo-N-(2,4-dibromophenyl)acetamide (CAS 1343087-57-9)
- 4-(Z-amino)-1-butanol (CAS 17996-13-3)
- Thymopoietin II Peptide Fragment (CAS 56795-64-3)
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