| Chemical Structure | CAT No. | CAS | Item Group | Purity |
|---|---|---|---|---|
 | C4X-145817 | N/A | Impurity | |
| Allopurinol impurity 17 | ||||
| C4X-145818 | N/A | Impurity | |
| Allopurinol impurity 18 | ||||
| C4X-145819 | 853754-87-7 | Impurity | |
| Allopurinol impurity 19 | ||||
 | C4X-14582 | 22407-20-1 | Impurity | |
| Allopurinol EP Impurity B | ||||
| C4X-145820 | N/A | Impurity | |
| Allopurinol impurity 20 | ||||
| C4X-145821 | N/A | Impurity | |
| Allopurinol impurity 21 | ||||
| C4X-145822 | N/A | Impurity | |
| Allopurinol impurity 22 | ||||
| C4X-145823 | N/A | Impurity | |
| Allopurinol impurity 23 | ||||
| C4X-145824 | 777835-45-7 | Impurity | |
| Allopurinol impurity 24 | ||||
| C4X-145825 | 2303964-80-7 | Impurity | |
| Allopurinol impurity 25 | ||||
