18,19-Dimethoxy-7-(thiophen-3-yl)-4,5,9,13-tetraazapentacyclo[11.8.0.0^{3,11}.0^{4,8}.0^{16,21}]henicosa-3(11),5,7,9,16(21),17,19-heptaen-12-one CAS 685107-13-5
| CAS No. | 685107-13-5 |
| Molecular Formula | C23H20N4O3S |
| Molecular Weight | 432.49 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
18,19-Dimethoxy-7-(thiophen-3-yl)-4,5,9,13-tetraazapentacyclo[11.8.0.0^{3,11}.0^{4,8}.0^{16,21}]henicosa-3(11),5,7,9,16(21),17,19-heptaen-12-one (CAS 685107-13-5), molecular formula C23H20N4O3S and molecular weight 432.49 g/mol, is a CATO reference standard with documented purity and traceability.
18,19-Dimethoxy-7-(thiophen-3-yl)-4,5,9,13-tetraazapentacyclo[11.8.0.0^{3,11}.0^{4,8}.0^{16,21}]henicosa-3(11),5,7,9,16(21),17,19-heptaen-12-one (C23H20N4O3S) contains a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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 | C23H20N4O3S |
| Molecular Weight | 432.49 g/mol |
| Purity | 97%+ |
| 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) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
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- 3-Deazauridine-5-triphosphate (CAS 54267-16-2)
- 2,5-Dihydroxybenzaldehyde (CAS 1194-98-5)
- D-Trp25-Tirzepatide (CAS CATO-CPTD788909)
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