3-Methyl-6-(pyridin-4-yl)isoxazolo[5,4-b]pyridine-4-carboxylic acid CAS 954262-12-5
| CAS No. | 954262-12-5 |
| Molecular Formula | C13H9N3O3 |
| Molecular Weight | 255.23 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3-Methyl-6-(pyridin-4-yl)isoxazolo[5,4-b]pyridine-4-carboxylic acid (CAS 954262-12-5), molecular formula C13H9N3O3 and molecular weight 255.23 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 3-Methyl-6-(pyridin-4-yl)isoxazolo[5,4-b]pyridine-4-carboxylic acid (C13H9N3O3) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 11.0, corresponding to approximately 11 ring(s) or double-bond equivalent(s). With a molecular weight of 255.23 g/mol, it falls into the medium-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
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 | C13H9N3O3 |
| Molecular Weight | 255.23 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Nitrogen Atoms | 3 |
Related Methyl Standards
- 3-methyl-6-pyridin-3-ylisoxazolo[5,4-b]pyridine-4-carboxylic acid (CAS 953745-07-8)
- (2e)-3-{4-[(pyridin-2-yl)methoxy]phenyl}prop-2-enoic acid (CAS 1802318-95-1)
- (2E)-3-[4-(pyridin-3-ylmethoxy)phenyl]acrylic acid (CAS 1807941-43-0)
- (2e)-3-{4-[(pyridin-3-yl)methoxy]phenyl}prop-2-enoic acid (CAS 227104-92-9)
- 3-(4-(Pyridin-2-ylmethoxy)phenyl)acrylic acid (CAS 50596-42-4)
- 3-[4-(pyridin-4-ylmethoxy)phenyl]acrylic acid (CAS 924865-90-7)
- 2-(2-(3-(Pyridin-2-yl)-1,2,4-oxadiazol-5-yl)-1H-pyrrol-1-yl)ethanamine (CAS 1707375-64-1)
- 3-(Pyridin-3-yl)-2-sulfanyl-3,4-dihydroquinazolin-4-one (CAS 119426-82-3)
Recommended Standards
- 3-Methyl-6-(3-nitrophenyl)-[1,2,4]triazolo[4,3-b]pyridazine (CAS 66548-74-1)
- 3-Amino-1,2-dihydroxyanthracene-9,10-dione (CAS 3963-78-8)
- 4-((2,6-Dimethoxypyrimidin-4-yl)amino)-4-oxobutanoic acid (CAS 303134-31-8)
- 3-Azido-2,3-dideoxyuridine (CAS 84472-85-5)
- 2-Cyclopropoxy-N,3-dimethylbenzamide (CAS 1243401-85-5)
- 3-(1-Isopropylpiperidin-2-yl)-N,N-dimethylpyridin-2-amine (CAS 1352506-05-8)
- (2-Methyl-4-(1H-pyrrol-1-yl)phenyl)boronic acid (CAS 2225169-03-7)
- 1-(3-(6-Bromopyridin-2-yl)piperidin-1-yl)ethan-1-one (CAS 1316225-89-4)
- 5-Methyluridine-1- (CAS 201996-60-3)
- 4-Chloro-5-iodo-6-methoxy-2-methylpyrimidine (CAS 111079-20-0)
- 2,3-Difluorophenyl ethyl carbonate (CAS 1235492-41-7)
- 1-(6-Methylpyrazin-2-yl)piperidine-3-carbaldehyde (CAS 941716-81-0)
- 3-(1-Methyl-1H-indol-3-yl)-3-oxopropanenitrile (CAS 343778-74-5)
- Semaglutide impurity 270 (CAS CATO-C4X-2226270)
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