 | C4X-152550 | 245759-62-0 | Impurity | |
| Formoterol Impurity 50 |
 | C4X-152551 | 2386293-34-9(Free Base) | Impurity | |
| Formoterol Impurity 51 HCl |
| C4X-152552 | N/A | Impurity | |
| "(R,R)-Formoterol Impurity 97" |
| C4X-152553 | 188690-83-7 | Impurity | |
| "(R,R)-Formoterol Impurity 53" |
| C4X-152554 | 193761-53-4 | Impurity | |
| Formoterol Impurity 54 |
| C4X-152555 | 67346-60-5 | Impurity | |
| Formoterol Impurity 55 |
| C4X-152556 | 333796-54-6 | Impurity | |
| Formoterol Impurity 56 |
| C4X-152557 | 408497-91-6 | Impurity | |
| "(R,R)-Formoterol Impurity 57" |
 | C4X-15256 | 1795129-59-7 | Impurity | |
| Formoterol EP Impurity F (Mixture of Diastereomers) |
| C4X-152563 | 67346-59-2 | Impurity | |
| Formoterol Impurity 63 |
