 | C4X-16491 | 1820-81-1 | Impurity | |
| Fluorouracil EP Impurity E |
 | C4X-164910 | 1480-96-2 | Impurity | |
| Fluorouracil Impurity 10 |
 | C4X-164911 | 37103-91-6 | Impurity | |
| Fluorouracil Impurity 11 (Mixture of Diastereomers) |
 | C4X-164912 | 496-76-4 | Impurity | |
| Fluorouracil EP Impurity B |
 | C4X-164914 | 6623-81-0 | Impurity | |
| Fluorouracil Impurity 14 |
 | C4X-164915 | 67-52-7 | Impurity | |
| Fluorouracil Impurity 15 |
 | C4X-164917 | 5440-00-6 | Impurity | |
| Fluorouracil Impurity 17 |
| C4X-164918 | N/A | Impurity | |
| Fluorouracil Impurity 18 |
| C4X-164919 | 1210289-53-4 | Impurity | |
| Fluorouracil Impurity 19 Hydrate (Mixture of Diastereomers) |
| C4X-164920 | N/A | Impurity | |
| Fluorouracil Impurity 20 |
