KU-55933 CAS 587871-26-9
| CAS No. | 587871-26-9 |
| Molecular Formula | C21H17NO3S2 |
| Molecular Weight | 395.49 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
KU-55933 (CAS 587871-26-9), molecular formula C21H17NO3S2 and molecular weight 395.49 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C21H17NO3S2, KU-55933 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 395.49 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C21H17NO3S2 |
| Molecular Weight | 395.49 g/mol |
| 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) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1984 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 2 |
Recommended Standards
- Fmoc-(2S)-2-amino-6,6-dimethylheptanoic acid (CAS 2349756-34-7)
- N-(naphthalen-1-yl)-[1,1-binaphthalen]-4-amine (CAS 2222442-87-5)
- Fmoc-(2R)-2-amino-6,6-dimethylheptanoic acid (CAS 2350170-64-6)
- N-Cyclopentyl-2-[[2-(4-Fluorophenyl)-6-Methyl-4-Quinazolinyl]Thio]-Acetamide (CAS 606131-34-4)
- 1-(Bromomethyl)-1-(2-methoxyethyl)cyclopropane (CAS 1464915-77-2)
- 2-(7-Azaspiro[3.5]Nonan-7-yl)ethan-1-ol (CAS 1865019-04-0)
- Ethyl 1-(3-chlorophenyl)-4-hydroxy-6-oxo-1,6-dihydropyridazine-3-carboxylate (CAS 339011-40-4)
- 1,3-Dichloro-5-(trifluoromethyl)benzene (CAS 54773-20-5)
- 4-(4,4-Difluoropiperidin-1-yl)-3-nitrobenzaldehyde (CAS 1707357-92-3)
- 3-Acetyl-5-fluorobenzonitrile (CAS 105515-21-7)
- 3-Methyl-1-[(4-methylphenyl)methyl]-1h-pyrazol-5-amine (CAS 956935-25-4)
- 2-Amino-N-cyclopentyl-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxamide (CAS 590358-28-4)
- Ethyl 2-Amino-6-(2-methylpropyl)-4H,5H,6H,7H-thieno[2,3-c]pyridine-3-carboxylate (CAS 802313-16-2)
- Semaglutide impurity 71 (CAS CATO-C4X-222671)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com