 | C4X-149812 | N/A | Impurity | |
| Tramadol Impurity 12 |
| C4X-149813 | 905592-54-3 | Impurity | |
| Tramadol Impurity 13 |
| C4X-149815 | N/A | Impurity | |
| Tramadol impurity 15 |
| C4X-149816 | 80456-81-1 | Impurity | |
| Tramadol EP Impurity D ( and Enantiomer) |
 | C4X-14982 | 66170-31-8 | Impurity | |
| Tramadol EP Impurity C HCl |
 | C4X-14983 | 73806-49-2 | Impurity | |
| Tramadol EP Impurity A HCl ( and Enantiomer ) |
 | C4X-14985 | 1018989-94-0 | Impurity | |
| N-Desmethyl Tramadol HCl ( Enantiomer ) |
 | C4X-14986 | 42036-65-7 | Impurity | |
| Tramadol EP Impurity E HCl |
| C4X-14988 | 192834-41-1 | Impurity | |
| Tramadol EP Impurity C HCl |
 | C4X-14989 | 147441-56-3 | Impurity | |
| Tramadol N-Oxide |
