3-Oxo-4-azaandrosta-1,5,7-triene-17-carboxylic Acid Methyl Ester CAS 166896-63-5
| CAS No. | 166896-63-5 |
| Molecular Formula | C20H25NO3 |
| Molecular Weight | 327.42 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
3-Oxo-4-azaandrosta-1,5,7-triene-17-carboxylic Acid Methyl Ester (CAS 166896-63-5), molecular formula C20H25NO3 and molecular weight 327.42 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, 3-Oxo-4-azaandrosta-1,5,7-triene-17-carboxylic Acid Methyl Ester is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 327.42 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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.
Physical & Chemical Properties
| Molecular Formula | C20H25NO3 |
| Molecular Weight | 327.42 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2004 |
| Nitrogen Atoms | 1 |
Recommended Standards
- Ditert-butyl2,5,8-triazaspiro[3.5]nonane-2,8-dicarboxylate (CAS 1639963-79-3)
- tert-Butyl 6-benzyl-8-cyano-2,6-diazaspiro[3.4]octane-2-carboxylate (CAS 1823261-86-4)
- (E)-Kresoxim-4-hydroxy (free acid) (CAS 1639810-29-9)
- 2-(4-(Benzyloxy)-3-(hydroxymethyl)phenyl)-N-(tert-butyl)acetamide (CAS 1956335-15-1)
- 3-Chloro-5-ethoxy-4-[(4-methylbenzyl)oxy]benzaldehyde (CAS 634593-07-0)
- Dazoxiben (free base) (CAS 78218-09-4)
- 4-Bromopyridine-2,6-dicarbaldehyde (CAS 128184-01-0)
- 3-(2-Aminoethyl)-1,1-dimethylurea (CAS 72080-85-4)
- 2-(Dimethylamino)-3-(methylamino)anthracene-9,10-dione (CAS 62468-66-0)
- 3-(Ethoxycarbonylamino)phenothiazine (CAS 14966-87-1)
- Palbociclib Impurity 112 (CAS CATO-C4X-1125112)
- (4-amino-3-bromo-2-chlorophenyl)methanol (CAS 112279-85-3)
- 4-((2-Methoxyethoxy)methoxy)benzaldehyde (CAS 117942-41-3)
- Heptapeptide-6 (CAS CATO-CPTD788823)
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