 | C4X-152567 | 871266-45-4 | Impurity | |
| Formoterol Impurity 67 |
| C4X-15257 | 23239-32-9 | Impurity | |
| Formoterol EP Impurity G |
 | C4X-152572 | 108971-53-5 | Impurity | |
| Formoterol Impurity 72 |
| C4X-152573 | N/A | Impurity | |
| Formoterol Impurity 73 |
| C4X-152578 | 67346-49-0(Free Base) | Impurity | |
| "(R,R)-Formoterol Impurity Tartrate" |
| C4X-152579 | 143687-24-5 | Impurity | |
| (RR+SS)-Formoterol Impurity 79 Hemifumarate |
| C4X-15258 | N/A | Impurity | |
| Formoterol EP Impurity H (Enantiomer Mixture) |
| C4X-152580 | 143687-26-7 | Impurity | |
| (RS+SR)-Formoterol Impurity 80 Hemifumarate |
| C4X-152587 | N/A | Impurity | |
| Formoterol Impurity 87 |
| C4X-152588 | N/A | Impurity | |
| rac-Formoterol Impurity 57 HCl |
