Methotrexate Impurity 28 CAS 5939-37-7
Purity >95%In StockPharmacopoeial Impurity Standards
| CAS No. | 5939-37-7 |
| Molecular Formula | C20H22N8O6 |
| Molecular Weight | 470.44 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Methotrexate Impurity 28 (CAS 5939-37-7) reference standard, produced by CATO (ISO 17034 / CNAS / ANAB accredited). Molecular formula: C20H22N8O6. Molecular weight: 470.44 g/mol. Trusted by 10,000+ laboratories worldwide for pharmaceutical analysis and QC.
Physical & Chemical Properties
| Molecular Formula | C20H22N8O6 |
| Molecular Weight | 470.44 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store in a cool place (≤25°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) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 8 |
Related Methotrexate Standards
- Methotrexate EP Impurity H (CAS 67022-39-3)
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- Methotrexate impurity N3 (CAS 65148-64-3)
- Methotrexate EP Impurity J (CAS 34378-65-9)
- Methotrexate Impurity 61 (CAS 65148-63-2)
- Methotrexate-d3 (CAS 432545-63-6)
Recommended Standards
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- Etoricoxib Impurity 86 (CAS CATO-C4X-108086)
- 1-(2-Chloro-3-fluorophenyl)-2,2,2-trifluoroethan-1-ol (CAS 2228943-38-0)
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- 477762-45-1 8-[(E)-2-[1-(4-fluorophenyl)ethylidene]hydrazin-1-yl]quinoline hydrochloride 8P-859 (CAS 477762-45-1)
- 7-(Benzo[d][1,3]dioxol-5-yl)pyrazolo[1,5-a]pyrimidine-3-carbonitrile (CAS 685106-66-5)
- Acetyl Tetrapeptide- 15 (CAS 928007-64-1)
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