 | C4X-20772 | 107878-38-6 | Impurity | |
| Fenoterol EP Impurity A (Enantiomer Mixture) |
 | C4X-20774 | 161040-25-1 | Impurity | |
| Fenoterol Impurity 4 |
 | C4X-20775 | 1944-11-2 | Impurity | |
| Fenoterol EP Impurity B (Enantiomer Mixture)HCl |
| C4X-20776 | N/A | Impurity | |
| Fenoterol Impurity 6 |
| C4X-20777 | N/A | Impurity | |
| Fenoterol Impurity 7 |
| C4X-20778 | N/A | Impurity | |
| Fenoterol Impurity 8 HBr |
| C4X-20779 | N/A | Impurity | |
| Fenoterol Impurity 8 xHBr |
 | C4X-20781 | 649765-80-0 | Impurity | |
| Dihydralazine EP Impurity A |
 | C4X-20783 | 304-20-1 | Impurity | |
| Dihydralazine EP Impurity C |
| C4X-20784 | 649765-80-0 (free base) | Impurity | |
| Dihydralazine EP Impurity A HCl |
