Levothyroxine impurities and related standards
6 reference standards related to Levothyroxine held in the RSSE catalogue — pharmacopoeial impurities, non-compendial impurities, metabolites and labelled analogues where available.
CAS numbers are listed for 6 of 6; 5 entries carry a structure drawing.
| Compound | CAS No. | Catalogue No. | Formula | MW |
|---|---|---|---|---|
| Levothyroxine Impurity 21 | 107849-54-7 | RS-L022002 | C15H11I4NO5 | 792.87 |
| Levothyroxine Impurity 58 | 176258-87-0 | RS-L022003 | C14H11I3O2 | 591.95 |
| Levothyroxine Impurity 18 | 176258-88-1 | RS-L022004 | C14H9I4NO3 | 746.68 |
| Levothyroxine Impurity 29 | 2055-94-9 | RS-L022005 | C13H8I4O3 | 719.82 |
| Levothyroxine Impurity K | 5817-39-0 | RS-L022006 | C15H12I3NO4 | 650.97 |
| Levothyroxine EP Impurity E | 1041-01-6 | RS-L022001 | C15H13I2NO4 | 525.08 |
Structures
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Levothyroxine Impurity 21
COA per lot -
Levothyroxine Impurity 58
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Levothyroxine Impurity 18
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Levothyroxine Impurity 29
COA per lot -
Levothyroxine Impurity K
COA per lot -
Levothyroxine EP Impurity E
COA per lot
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