 | C4X-100140 | N/A | Impurity | |
| Erythromycin Impurity 40 |
| C4X-100141 | 33275-72-8 | Impurity | |
| Erythromycin Impurity 41 |
 | C4X-100142 | 3225-82-9 | Impurity | |
| Erythromycin EP Impurity N |
 | C4X-100143 | 33442-56-7 | Impurity | |
| Erythromycin EP Impurity K |
 | C4X-100144 | 616234-56-1 | Impurity | |
| Erythromycin EP Impurity M |
| C4X-100145 | 1094780-33-2 | Impurity | |
| Erythromycin Impurity 45 |
| C4X-100146 | N/A | Impurity | |
| Erythromycin Impurity 46 |
| C4X-100149 | 229318-98-3 | Impurity | |
| Erythromycin Impurity 49 |
 | C4X-10015 | 105882-69-7 | Impurity | |
| Erythromycin EP Impurity F |
| C4X-100150 | 37152-22-0 | Impurity | |
| Erythromycin Impurity 50 |
