 | C4X-12263 | 2887-91-4 | Impurity | |
| "Desmethyl Doxepin HCl (Nordoxepin HCl, Mixture of Z and E Isomers)" |
 | C4X-12265 | 25127-31-5 | Impurity | |
| Doxepin EP Impurity D HCl ((Z)-Doxepin HCl) |
 | C4X-12267 | 4504-87-4 | Impurity | |
| Doxepin Impurity 7 |
 | C4X-12268 | 4504-88-5 | Impurity | |
| Doxepin EP Impurity B |
 | C4X-12271 | N/A | Impurity | |
| Oxybuprocaine Impurity 1 |
| C4X-122710 | N/A | Impurity | |
| Oxybuprocaine Impurity 10 |
| C4X-122711 | N/A | Impurity | |
| Oxybuprocaine Impurity 11 |
| C4X-122712 | N/A | Impurity | |
| Oxybuprocaine Impurity 12 |
 | C4X-12272 | 23442-22-0 | Impurity | |
| Oxybuprocaine EP Impurity B |
 | C4X-12273 | 2374-03-0 | Impurity | |
| Oxybuprocaine Impurity 3 |
