 | C4X-16472 | N/A | Impurity | |
| Flucloxacillin Sodium EP Impurity B |
| C4X-164720 | N/A | Impurity | |
| Flucloxacillin Impurity 20 |
 | C4X-16474 | 3919-74-2 | Impurity | |
| Flucloxacillin Sodium EP Impurity D |
| C4X-16475 | N/A | Impurity | |
| Flucloxacillin EP Impurity E |
| C4X-16477 | 42947-70-6 | Impurity | |
| Flucloxacillin impurity 7 |
 | 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 |
