 | C4X-18372 | 61771-18-4 (free base) | Impurity | |
| rac-Clemastine Fumarate EP Impurity B HCl |
 | C4X-18373 | 59767-24-7 | Impurity | |
| Clemastine EP Impurity C |
| C4X-18374 | 67004-64-2 | Impurity | |
| Clemastine Impurity 4 |
| C4X-18375 | 61826-32-2 | Impurity | |
| "Clemastine Impurity 5 Fumarate (S,R-isomer)" |
| C4X-18378 | 18218-20-7 | Impurity | |
| Chloramistine Impurity 8 |
 | C4X-18381 | 100-69-6 | Impurity | |
| Betahistine EP Impurity A |
 | C4X-183811 | 2706-56-1 | Impurity | |
| Betahistine Impurity 11 |
 | C4X-183812 | 109-06-8 | Impurity | |
| Betahistine Impurity 12 |
| C4X-183813 | 13585-92-7?free base? | Impurity | |
| Betahistine Impurity 13 HCl |
| C4X-183814 | 88796-99-0 (free base) | Impurity | |
| Betahistine Impurity4 HCl |
