 | C4X-181311 | 111943-62-5 | Impurity | |
| Butylphthalide Impurity 11 |
| C4X-181314 | 61658-90-0 | Impurity | |
| Butylphthalide Impurity 14 |
 | C4X-181315 | 3453-64-3 | Impurity | |
| Butylphthalide Impurity 15 |
 | C4X-181316 | 577-56-0 | Impurity | |
| Butylphthalide Impurity 16 |
| C4X-181318 | N/A | Impurity | |
| Butylphthalide Impurity 18 |
 | C4X-181319 | 17369-59-4 | Impurity | |
| Butylphthalide Impurity 19 |
 | C4X-18132 | 551-08-6 | Impurity | |
| Butylphthalide Impurity 2 |
| C4X-181323 | 199736-94-2 | Impurity | |
| Butylphthalide Impurity 23 |
| C4X-181325 | 3453-63-2 | Impurity | |
| Butylphthalide Impurity 25 |
| C4X-181327 | 551-08-6 | Impurity | |
| Butylphthalide Impurity 27 (mixture of cis and trans isomers) |
