 | C4X-13826 | N/A | Impurity | |
| Flomoxef Impurity 6 |
| C4X-13827 | N/A | Impurity | |
| Flomoxef Impurity 7 |
| C4X-13828 | N/A | Impurity | |
| Flomoxef Impurity 8 |
| C4X-13829 | 2095697-77-9 (free acid) | Impurity | |
| Flomoxef Impurity 9 Sodium Sal |
| C4X-138310 | 114393-97-4 | Impurity | |
| Pioglitazone Aldehyde Impurity |
| C4X-138313 | N/A | Impurity | |
| Pioglitazone Impurity 13 |
| C4X-138314 | 1526933-30-1 | Impurity | |
| Pioglitazone Impurity 14 |
 | C4X-138315 | 291536-42-0 | Impurity | |
| Pioglitazone Impurity 15 |
 | C4X-138317 | 146062-45-5 | Impurity | |
| Pioglitazone Ketone (M-III) |
 | C4X-138318 | 136401-69-9 | Impurity | |
| (5Z)-Pioglitazone EP Impurity B |
