 | C4X-14181 | 92-84-2 | Impurity | |
| Promethazine EP Impurity A |
 | C4X-141811 | 108-16-7 | Impurity | |
| Promethazine Impurity 11 |
 | C4X-141812 | 4584-49-0 | Impurity | |
| Promethazine Impurity 12 |
 | C4X-141814 | 1135334-50-7 | Impurity | |
| Promethazine Sulfoxide N-Oxide HCl |
 | C4X-141815 | 303-14-0 | Impurity | |
| Promethazine EP Impurity B |
| C4X-141816 | N/A | Impurity | |
| Promethazine Impurity 16 |
| C4X-141817 | N/A | Impurity | |
| Promethazine Impurity 17 HCl |
| C4X-141818 | N/A | Impurity | |
| Promethazine Impurity 18 TFA Salt |
| C4X-141819 | N/A | Impurity | |
| Promethazine Impurity 19 |
 | C4X-14182 | 5568-90-1 | Impurity | |
| Promethazine EP Impurity B HCl |
