 | C4X-152588 | N/A | Impurity | |
| rac-Formoterol Impurity 57 HCl |
| C4X-152589 | N/A | Impurity | |
| Formoterol Impurity 89 |
 | C4X-15259 | 532414-36-1 | Impurity | |
| Formoterol EP Impurity I (Enantiomer Mixture) |
| C4X-152590 | 43229-68-1(free base) | Impurity | |
| Formoterol Impurity 27 HCl |
| C4X-152591 | 43229-67-0(free base) | Impurity | |
| Formoterol Impurity 29 HCl |
| C4X-152592 | N/A | Impurity | |
| Formotero Impurity 92 |
| C4X-152593 | N/A | Impurity | |
| Formoterol Impurity 93 |
| C4X-152594 | N/A | Impurity | |
| Formoterol Impurity 94 |
| C4X-152595 | N/A | Impurity | |
| Formoterol Impurity 95 |
| C4X-152596 | 5029-61-8 | Impurity | |
| Formoterol Impurity 96 |
