 | C4X-139626 | 1346617-18-2 | Impurity | |
| (R)-Azelastine N-Oxide (Mixture of Diastereomers) |
 | C4X-139627 | 19869-42-2 | Impurity | |
| Azelastine Impurity 27 HCl |
 | C4X-139628 | 105279-16-1 | Impurity | |
| Azelastine EP Impurity E (Z-Isomer) |
 | C4X-139629 | 1859-33-2 (free base) | Impurity | |
| Azelastine Impurity 29 |
 | C4X-139630 | 117078-70-3 | Impurity | |
| Azelastine Impurity 30 |
| C4X-139631 | N/A | Impurity | |
| Azelastine Impurity 31 HCl |
 | C4X-139633 | 53242-76-5 | Impurity | |
| Azelastine Impurity 33 |
 | C4X-139634 | 1878-66-6 | Impurity | |
| Azelastine Impurity 34 |
| C4X-139635 | N/A | Impurity | |
| Azelastine Impurity 35 |
| C4X-139637 | N/A | Impurity | |
| Azelastine Impurity 37 |
