3-Ethyl-5,6-dimethyl-2-((2-oxo-2-phenylethyl)thio)thieno[2,3-d]pyrimidin-4(3H)-one CAS 335399-66-1
| CAS No. | 335399-66-1 |
| Molecular Formula | C18H18N2O2S2 |
| Molecular Weight | 358.48 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C18H18N2O2S2, 3-Ethyl-5,6-dimethyl-2-((2-oxo-2-phenylethyl)thio)thieno[2,3-d]pyrimidin-4(3H)-one contains a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 358.48 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).
3-Ethyl-5,6-dimethyl-2-((2-oxo-2-phenylethyl)thio)thieno[2,3-d]pyrimidin-4(3H)-one (CAS 335399-66-1), molecular formula C18H18N2O2S2 and molecular weight 358.48 g/mol, is a CATO reference standard with documented purity and traceability.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C18H18N2O2S2 |
| Molecular Weight | 358.48 g/mol |
| 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.) | 2025 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 2 |
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Recommended Standards
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- 4'-[({[(2Z)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene]amino}oxy)methyl]-[1,1'-biphenyl]-2-carbonitrile (CAS 946386-30-7)
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- IC 261 (CAS 186611-52-9)
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- Endo-38a-Pro-Exenatide trifluoroacetate salt (CAS 1678416-95-9)
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