 | C4X-145826 | N/A | Impurity | |
| Allopurinol impurity 26 |
| C4X-145827 | N/A | Impurity | |
| Allopurinol impurity 27 |
| C4X-145828 | N/A | Impurity | |
| Allopurinol impurity 28 |
| C4X-145829 | N/A | Impurity | |
| Allopurinol impurity 29 |
 | C4X-14583 | 1346604-13-4 | Impurity | |
| Allopurinol EP Impurity C |
| C4X-145830 | 18197-22-3 | Impurity | |
| Allopurinol impurity 30 |
 | C4X-14584 | 6994-25-8 | Impurity | |
| Allopurinol EP Impurity D |
 | C4X-14585 | 31055-19-3 | Impurity | |
| Allopurinol EP Impurity E |
 | C4X-14587 | 321571-07-7 | Impurity | |
| Allopurinol Impurity 7(Allopurinol Impurity F) |
 | C4X-14588 | 5334-31-6 | Impurity | |
| Allopurinol EP Impurity A |
