 | C4X-181321 | 152567-80-1 | Impurity | |
| Butylphthalide Impurity 21 |
| C4X-181322 | 14570-43-5 | Impurity | |
| Butylphthalide Impurity 22 |
| C4X-181323 | 199736-94-2 | Impurity | |
| Butylphthalide Impurity 23 |
| C4X-181324 | 20871-32-3 | Impurity | |
| Butylphthalide Impurity 24 |
| C4X-181325 | 3453-63-2 | Impurity | |
| Butylphthalide Impurity 25 |
| C4X-181326 | 20871-40-3 | Impurity | |
| Butylphthalide Impurity 26 |
 | C4X-181327 | 551-08-6 | Impurity | |
| Butylphthalide Impurity 27 (mixture of cis and trans isomers) |
| C4X-181329 | N/A | Impurity | |
| Butylphthalide Impurity 29 |
| C4X-18133 | 550-37-8 | Impurity | |
| Butylphthalide Impurity 3 |
| C4X-181330 | 17475-41-1 | Impurity | |
| Butylphthalide Impurity 30 |
