| Chemical Structure | CAT No. | CAS | Item Group | Purity |
|---|---|---|---|---|
 | C4X-182310 | N/A | Impurity | |
| Theophylline Impurity 10 | ||||
| C4X-182311 | N/A | Impurity | |
| Theophylline Impurity 11 | ||||
| C4X-182312 | N/A | Impurity | |
| Theophylline Impurity 12 | ||||
| C4X-182314 | N/A | Impurity | |
| Theophylline Impurity 14 | ||||
| C4X-18232 | 6136-37-4 | Impurity | |
| Theophylline Impurity 2 | ||||
 | C4X-18233 | 60797-68-4 | Impurity | |
| Theophylline Impurity 3 | ||||
| C4X-18234 | N/A | Impurity | |
| Theophylline Impurity 4 | ||||
| C4X-18236 | N/A | Impurity | |
| Theophylline impurity 6 | ||||
| C4X-18237 | N/A | Impurity | |
| Theophylline impurity 7 | ||||
| C4X-18239 | N/A | Impurity | |
| Istradefylline Impurity 29 | ||||
