| Doxepin Process impurity 1 | 4504-87-4 | Ax-IMP1231 |
| Doxepin impurity C | 4504-96-5 | Ax-IMP1229 |
| Doxepin impurity D | 3607-18-9 | Ax-IMP1230 |
| Moxonidine Process Impurity 1 | 1008754-14-0 | Ax-IMP1175 |
| Moxonidine Impurity B | 75439-01-9 | Ax-IMP1174 |
| Aspirin Working Standard | 50-78-2 | Ax-IMP1188 |
| Aspirin impurity D | 530-75-6 | Ax-IMP1189 |
| Aspirin impurity E | 552-94-3 | Ax-IMP1190 |
| Aspirin impurity F | 1466-82-6 | Ax-IMP1191 |
| Solifenacin Process Impurity 1 | 1838-39-7 | Ax-IMP1145 |