 | C4X-173214 | 64817-22-7 | Impurity | |
| Piperacillin Impurity 14(Piperacillin EP Impurity B) |
 | C4X-173215 | 2170771-47-6 | Impurity | |
| Piperacillin EP Impurity J |
 | C4X-173216 | 2734474-72-5 | Impurity | |
| Piperacillin Impurity 16 |
 | C4X-173217 | 65772-67-0 | Impurity | |
| Piperacillin EP Impurity D |
| C4X-173218 | N/A | Impurity | |
| Piperacillin Impurity 18 |
| C4X-173219 | N/A | Impurity | |
| Piperacillin Impurity 19 |
| C4X-173220 | N/A | Impurity | |
| Piperacillin Impurity 20 |
| C4X-173221 | 64844-70-8 | Impurity | |
| Piperacillin Impurity 21 |
 | C4X-173223 | 2649505-15-5 | Impurity | |
| Piperacillin EP Impurity C |
 | C4X-173224 | 158411-82-6 | Impurity | |
| DL-Piperacillin EP Impurity I |
