Levothyroxine Impurity 18 CAS 1155-40-4
Purity >95%In StockPharmacopoeial Impurity Standards
| CAS No. | 1155-40-4 |
| Molecular Formula | C14H10I2O4 |
| Molecular Weight | 496.04 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Levothyroxine Impurity 18 (CAS 1155-40-4) is a high-purity pharmacopoeial impurity standards reference standard from CATO, an ISO 17034 accredited reference material producer. Molecular formula: C14H10I2O4. Molecular weight: 496.04 g/mol. Each batch is supplied with a Certificate of Analysis (COA).
Physical & Chemical Properties
| Molecular Formula | C14H10I2O4 |
| Molecular Weight | 496.04 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | >95% |
| Storage | Store in a cool place (≤25°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; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | I-containing |
Related Levothyroxine Standards
- Levothyroxine Impurity 38 (CAS 1027-28-7)
- Levothyroxine Impurity 16 (CAS 4192-14-7)
- rac-Levothyroxine EP Impurity J (3,3'-DL-Diiodothyronine) (CAS 70-40-6)
- Levothyroxine EP Impurity J (CAS 4604-41-5)
- Levothyroxine EP Impurity E (CAS 1041-01-6)
- Levothyroxine Impurity 37 (CAS 94345-95-6)
- Levothyroxine Impurity 43 (CAS 854646-83-6)
- Levothyroxine Impurity 36 (CAS 100130-56-1)
Recommended Standards
- Indometacin Impurity 38 (CAS CATO-C4X-147038)
- 4-(5-Bromo-3-(bromo(2-chlorophenyl)methyl)thiophen-2-yl)-3-(chloromethyl)-5-methyl-4H-1,2,4-triazole (CAS 62551-57-9)
- Indometacin Impurity 37 (CAS CATO-C4X-147037)
- Hydrocortisone Impurity 33 (CAS 77106-62-8)
- Lenvatinib Impurity 77 (CAS CATO-C4X-114077)
- (8-(3,4-Dimethoxyphenyl)-1,4-dioxaspiro[4.5]Decan-8-yl)methanamine (CAS 887978-91-8)
- 2-(4-Chlorophenyl)-6-methylpyrimidin-4(3H)-one (CAS 16858-20-1)
- 6-Bromo-4-methyl-2H-benzo[b][1,4]thiazin-3(4H)-one (CAS 1783455-40-2)
- (2-Fluoro-4-(trifluoromethyl)phenyl)methanol (CAS 197239-49-9)
- Insulin Degludec Impurity 17 (CAS CATO-C4X-215717)
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 13829788188 / jacky.chen@cato-chem.com