 | C4X-167829 | N/A | Impurity | |
| Levothyroxine Impurity 29?Mixture of Diastereomers? |
 | C4X-16783 | 51-24-1 | Impurity | |
| Levothyroxine EP Impurity C |
 | C4X-167830 | 107849-54-7 | Impurity | |
| Levothyroxine Impurity 30 |
 | C4X-167831 | 93647-48-4 | Impurity | |
| Levothyroxine Related Compound |
 | C4X-167833 | 300-30-1 | Impurity | |
| DL-Thyroxine |
| C4X-167836 | 100130-56-1 | Impurity | |
| Levothyroxine Impurity 36 |
 | C4X-167837 | 94345-95-6 | Impurity | |
| Levothyroxine Impurity 37 |
 | C4X-167838 | 1027-28-7 | Impurity | |
| Levothyroxine Impurity 38 |
| C4X-167839 | 76353-71-4(free base) | Impurity | |
| Levothyroxine Impurity 39 |
 | C4X-16784 | 67-30-1 | Impurity | |
| Levothyroxine EP Impurity D |
