 | C4X-152576 | N/A | Impurity | |
| Formoterol Impurity 76 |
| C4X-152577 | N/A | Impurity | |
| N-ethyl Formoterol Impurity 77 |
| 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-152581 | 1337876-26-2 | Impurity | |
| "(R,R)-Formoterol EP Impurity H" |
| C4X-152582 | 67346-67-2 | Impurity | |
| "(S,S)-Formoterol EP Impurity H" |
| C4X-152586 | N/A | Impurity | |
| Formoterol Impurity 86 |
| C4X-152587 | N/A | Impurity | |
| Formoterol Impurity 87 |
