 | C4X-167817 | 51-26-3 | Impurity | |
| Levothyroxine Impurity 17 |
 | C4X-167818 | 1155-40-4 | Impurity | |
| Levothyroxine Impurity 18 |
 | C4X-167819 | 2088032-52-2 | Impurity | |
| Levothyroxine N-Methylamide |
 | C4X-16782 | 1628720-66-0 | Impurity | |
| Levothyroxine EP Impurity B |
 | C4X-167820 | 2230724-39-5 | Impurity | |
| Levothyroxine Impurity 20 |
 | C4X-167823 | 51-48-9 | Impurity | |
| L-Thyroxine |
 | C4X-167826 | 176258-88-1 | Impurity | |
| Levothyroxine Impurity 26 |
 | C4X-167827 | 671235-41-9 | Impurity | |
| Levothyroxine Impurity 27 |
| C4X-167829 | N/A | Impurity | |
| Levothyroxine Impurity 29?Mixture of Diastereomers? |
 | C4X-16783 | 51-24-1 | Impurity | |
| Levothyroxine EP Impurity C |
