GST-HG171 Impurity 8 CAS CATO-C4X-30608
| CAS No. | CATO-C4X-30608 |
| Molecular Formula | C18H25F3N2O4 |
| Molecular Weight | 390.40 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, fluorine substitution, GST-HG171 Impurity 8 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 390.40 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
GST-HG171 Impurity 8 (CAS CATO-C4X-30608) is a certified pharmaceutical impurity reference standard with the molecular formula C18H25F3N2O4 and a molecular weight of 390.40 g/mol.
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
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 | C18H25F3N2O4 |
| Molecular Weight | 390.40 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | >95% |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Recommended Standards
- GST-HG171 Impurity 1 (CAS CATO-C4X-30601)
- Falecalcitriol Impurity 1 (CAS 2454249-03-5)
- Vericiguat Impurity 25 (CAS CATO-C4X-289625)
- Falecalcitriol impurity 4 (CAS CATO-C4X-31414)
- Cefradine Impurity 13 (CAS CATO-C4X-121513)
- Gabapentin Impurity 11 (CAS 478296-72-9)
- Aztreonam impurity 95 (CAS CATO-C4X-152295)
- N-(2-ethoxyethyl)-4-methylcyclohexan-1-amine (CAS 1156424-88-2)
- Methyl 4-(2,3-dihydrobenzofuran-5-yl)-2-hydroxybutanoate (CAS 1480640-34-3)
- (4E)-4-{[(3,5-dichlorophenyl)amino]methylidene}-1-[4-(trifluoromethoxy)phenyl]-3-(trifluoromethyl)-4,5-dihydro-1H-pyrazol-5-one (CAS 338403-28-4)
- N-Ethyl-3-[(3-pyridinylmethyl)amino]propanamide (CAS 1040693-59-1)
- 3-(Chlorosulfonyl)-2,6-dimethylbenzoic acid (CAS 866358-15-8)
- 1-(3-Ethylphenyl)-2-methylpropan-2-ol (CAS 1754-69-4)
- D-Gln19-Tirzepatide (CAS CATO-CPTD788915)
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