1-(Isoxazol-3-yl)-3-phenylurea CAS 55807-72-2
| CAS No. | 55807-72-2 |
| Molecular Formula | C10H9N3O2 |
| Molecular Weight | 203.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 1-(Isoxazol-3-yl)-3-phenylurea 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.
1-(Isoxazol-3-yl)-3-phenylurea (CAS 55807-72-2) is a high-purity analytical reference standard with the molecular formula C10H9N3O2 and a molecular weight of 203.20 g/mol.
Based on its molecular formula C10H9N3O2, 1-(Isoxazol-3-yl)-3-phenylurea 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 203.20 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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.
Physical & Chemical Properties
| Molecular Formula | C10H9N3O2 |
| Molecular Weight | 203.20 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 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1972 |
| Nitrogen Atoms | 3 |
Related Isoxazol Standards
- Methyl 4-(isoxazol-5-yl)benzoate (CAS 1196059-61-6)
- Methyl 4-(isoxazol-3-yl)benzoate (CAS 1823904-36-4)
- Phenyl isoxazol-4-ylcarbamate (CAS 1190843-61-8)
- N-(isoxazol-4-yl)-2-phenylacetamide (CAS 1389313-62-5)
- (Isoxazol-4-ylsulfonyl)glycine (CAS 1706455-07-3)
- Methyl 5-(isoxazol-5-yl)-3-methyl-1H-pyrazole-4-carboxylate (CAS 175277-15-3)
- Ethyl 5-(isoxazol-3-yl)-1,2,4-oxadiazole-3-carboxylate (CAS 1343187-68-7)
- 3-(5-Ethyl-isoxazol-3-yl)-3-oxo-propionic acid methyl ester (CAS 1229627-42-2)
Recommended Standards
- 1-(5-Phenyl-1H-1,2,4-triazol-3-yl)urea (CAS 6642-32-6)
- 1-(Phenylamino)-1H-imidazole-4-carboxylic acid (CAS 549888-05-3)
- 1-(4-Methoxyphenyl)-1H-1,2,4-triazole-3-carbaldehyde (CAS 917910-97-5)
- 1-(Pyridin-3-ylmethyl)-1H-imidazole-4-carboxylic acid (CAS 549888-22-4)
- 5-Ethoxy-2-methyl-4-nitroaniline (CAS 1799439-08-9)
- 3-Bromo-7-(2,4-dichlorophenyl)-2-methylpyrazolo[1,5-a]pyrimidine (CAS 478249-01-3)
- 2-(6-Amino-2-methyl-1H-indol-3-yl)acetic acid (CAS 787545-15-7)
- 6-chloro-N-(2,2-difluoroethyl)-2-methylpyrimidin-4-amine (CAS 1552918-79-2)
- 55646-99-6 (4a'S,4b'R,5'S,6a'S,6b'S,9a'R,10a'S,10b'S)-4b'-Fluoro-5'-hydroxy-6b'-(hydroxyacetyl)-4a',6a'-dimethyl-4a',4b',5',6',6a',6b',9a',10',10a',10b',11',12'-dodecahydro-2'H-spiro[cyclopentane-1,8'-naphtho[2',1':4,5]indeno[1,2-d][1,3]dioxol]-2'-one DTXSID20747501 (CAS 55646-99-6)
- N-(4-Acetylphenyl)-2-phenylacetamide (CAS 89246-39-9)
- 3A,9b-dimethyl-3a,4,5,9b-tetrahydronaphtho[1,2-d]oxazol-2(1H)-one (CAS 696635-52-6)
- 4-(Dibutylamino)-N-[4-(dibutylamino)phenyl]-N-[4-(dibutyliminio)-2,5-cyclohexadien-1-ylidene]benzenaminium hexafluoroantimonate(1-) (CAS 197790-29-7)
- 3-((Thiophen-2-ylmethyl)amino)benzoic acid (CAS 869947-84-2)
- D-β-Asp15-Tirzepatide (CAS CATO-CPTD788930)
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