 | C4X-181325 | 3453-63-2 | Impurity | |
| Butylphthalide Impurity 25 |
 | C4X-181327 | 551-08-6 | Impurity | |
| Butylphthalide Impurity 27 (mixture of cis and trans isomers) |
| C4X-18133 | 550-37-8 | Impurity | |
| Butylphthalide Impurity 3 |
| C4X-181330 | 17475-41-1 | Impurity | |
| Butylphthalide Impurity 30 |
| C4X-181338 | 162050-43-3 | Impurity | |
| Butylphthalide Impurity 38 |
| C4X-181345 | 685886-82-2 | Impurity | |
| Butylphthalide Impurity 45 Potassium |
 | C4X-18135 | 612-20-4 | Impurity | |
| Butylphthalide Impurity 5 |
| C4X-181351 | 17689-42-8 | Impurity | |
| Butylphthalide Impurity 51 |
| C4X-181354 | 72424-08-9 | Impurity | |
| Butylphthalide Impurity 54 |
| C4X-181355 | 6066-49-5 | Impurity | |
| Butylphthalide Impurity 55 |
