 | C4X-139620 | 47491-38-3 | Impurity | |
| Azelastine Impurity 20 |
| C4X-139621 | 57676-51-4 | Impurity | |
| Azelastine Impurity 21 |
| C4X-139624 | N/A | Impurity | |
| Azelastine Impurity 24 Oxalate |
 | C4X-139625 | 1346617-06-8 | Impurity | |
| (S)-Azelastine N-Oxide (Mixture of Diastereomers) |
 | 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 |
