 | C4X-16784 | 67-30-1 | Impurity | |
| Levothyroxine EP Impurity D |
 | C4X-167840 | N/A | Impurity | |
| Levothyroxine Impurity 40 |
 | C4X-167841 | 2055-94-9 | Impurity | |
| Levothyroxine Impurity 41 |
| C4X-167842 | 4618-45-5 | Impurity | |
| Levothyroxine Impurity 42 |
 | C4X-167843 | 854646-83-6 | Impurity | |
| Levothyroxine Impurity 43 |
 | C4X-167844 | 176258-89-2 | Impurity | |
| Levothyroxine Impurity 44 |
| C4X-167845 | N/A | Impurity | |
| Levothyroxine lmpurity 45 |
| C4X-167846 | 92151-30-9 | Impurity | |
| Levothyroxine Impurity 46 |
| C4X-167847 | N/A | Impurity | |
| Levothyroxine impurity 47 |
 | C4X-167848 | 66701-15-3 | Impurity | |
| Levothyroxine EP Impurity K (R-Isomer) |
