 | 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-15261 | 462-20-4 | Impurity | |
| Thioctic acid Impurity 1 |
| C4X-152610 | 188783-96-2 | Impurity | |
| Thioctic Acid Impurity 10 |
| C4X-152612 | N/A | Impurity | |
| Thioctic Acid Impurity 12 |
| C4X-152619 | 91140-37-3 | Impurity | |
| Thioctic acid Impurity 19 |
 | C4X-15262 | 108015-78-7 | Impurity | |
| Thioctic acid Impurity 2 |
| C4X-152620 | N/A | Impurity | |
| Thioctic acid Impurity 20 |
 | C4X-152621 | 1077-27-6 | Impurity | |
| (S)-?-Lipoic Acid |
