4-Amino-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid CAS 89033-46-5
| CAS No. | 89033-46-5 |
| Molecular Formula | C4H5N3O3 |
| Molecular Weight | 143.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Amino-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid (CAS 89033-46-5) is a high-purity analytical reference standard with the molecular formula C4H5N3O3 and a molecular weight of 143.10 g/mol.
Based on its molecular formula C4H5N3O3, 4-Amino-5-oxo-4,5-dihydro-1H-pyrazole-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 143.10 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C4H5N3O3 |
| Molecular Weight | 143.10 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1982 |
| Nitrogen Atoms | 3 |
Related Amino Standards
- 4-Amino-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide (CAS 1211025-52-3)
- 2-Amino-4-oxo-4,5-dihydrofuran-3-carboxylic acid (CAS 123591-10-6)
- 4-Amino-N’-hydroxy-1,2,5-oxadiazole-3-carboximidamide (CAS 13490-32-9)
- 3-Acetyl-4-amino-1,2,5-oxadiazole 2-oxide (CAS 164926-69-6)
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Recommended Standards
- 4-Amino-5-hydroxy-2-oxo-2,5-dihydro-1H-imidazole-1-carbaldehyde (CAS 51495-77-3)
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- 4-Amino-1,2,5-oxadiazole-3-carbohydrazide (CAS 246048-72-6)
- 4-Nitro-1H-pyrazole-3,5-diamine (CAS 62063-02-9)
- (E)-3-(5-Bromo-2-(difluoromethoxy)phenyl)acrylic acid (CAS 507233-13-8)
- n'-Methylacetohydrazonamide (CAS 74147-20-9)
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- (3-Phenyl-1,2,4-oxadiazol-5-yl)methanamine hydrochloride (CAS 1216872-37-5)
- 4-((2,6-Dichloropyridin-4-yl)methyl)morpholine (CAS 1015844-22-0)
- (E)-Ethyl 3-(4-(1-(2-aminoethyl)-pyrrolidin-2-yl)phenyl)acrylate 1706519-96-1 (CAS 1706519-96-1)
- 2-(Furan-2-yl)-1H-pyrrole (CAS 63122-43-0)
- 3-Bromo-2-(3-chloro-2,2-dimethylpropyl)thiophene (CAS 1468817-15-3)
- 3-(Chloromethyl)-5-nitrobenzaldehyde (CAS 1393561-74-4)
- Vasonatrin Peptide (VNP) trifluoroacetate salt (CAS 141676-35-9)
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