Indocyanine Green Impurity 33 CAS CATO-C4X-250333
| CAS No. | CATO-C4X-250333 |
| Molecular Formula | C18H20NO4S |
| Molecular Weight | N/A |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Indocyanine Green Impurity 33 (CAS CATO-C4X-250333), a pharmacopoeial impurity reference standard (molecular formula C18H20NO4SNa, MW 369.41 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Indocyanine Green Impurity 33 (C18H20NO4SNa) is characterized by a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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 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 | C18H20NO4S Na |
| Molecular Weight | 369.41 g/mol |
| Purity | >90% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Indocyanine Standards
- Indocyanine Green Impurity 10 (CAS 109-70-6)
- Indocyanine Green Impurity 42 (CAS 1182721-75-0)
- Indocyanine Green Impurity 4 (CAS 1201170-49-1)
- Indocyanine Green Impurity 64 (CAS 1351043-94-1)
- Indocyanine Green Impurity 24 (CAS 13959-24-5)
- Indocyanine Green Impurity 14 (CAS 1497-49-0)
- Indocyanine Green Impurity 27 (CAS 1563-87-7)
- Indocyanine Green-Succinimidyl Ester (CAS 1622335-40-3)
Recommended Standards
- Rociletinib Impurity N1 (CAS 165897-63-2)
- Minoxidil Impurity 38 (CAS CATO-C4X-170038)
- Rosuvastatin impurity 245 (CAS 147118-41-0)
- (4-Bromo-2,6-dimethoxyphenyl)methanol (CAS 1823377-41-8)
- 2-(2,8-Dimethyl-4-oxoquinolin-1(4H)-yl)-N-(m-tolyl)acetamide (CAS 500195-11-9)
- 3-(2-Fluoro-6-iodophenyl)-1,2,4-oxadiazole (CAS 1262412-81-6)
- Eplerenone Impurity 42 (CAS CATO-C4X-163042)
- Benzyl (S)-3-(hydroxymethyl)piperazine-1-carboxylate hydrochloride (CAS 930782-84-6)
- 4-(3-Ethyl-1,2,4-oxadiazol-5-yl)benzonitrile (CAS 1421262-65-8)
- Biotinyl-Pancreatic Polypeptide (human) trifluoroacetate salt (CAS 1816258-36-2)
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