 | C4X-10607 | 1631131-52-6 | Impurity | |
| Bromhexine Impurity 7 |
| C4X-10608 | 1660957-78-7 | Impurity | |
| Bromhexine Impurity 8 |
| C4X-10609 | 63471-29-4 | Impurity | |
| Bromhexine Impurity 9 |
 | C4X-10611 | 606080-73-3 | Impurity | |
| Istradefylline Impurity 1 |
| C4X-106110 | N/A | Impurity | |
| Istradefylline Impurity 10 |
| C4X-106111 | 52998-22-8 | Impurity | |
| Istradefylline Impurity 11 |
| C4X-106112 | N/A | Impurity | |
| Istradefylline Impurity 12 |
| C4X-106113 | 14436-34-1 | Impurity | |
| Istradefylline Impurity 13 |
| C4X-106114 | 21237-00-3 | Impurity | |
| Istradefylline Impurity 14 |
| C4X-106115 | 89073-60-9 | Impurity | |
| Istradefylline Impurity 15 |
