| Fexofenadine Process Impurity | 185066-40-4 | Ax-IMP819 |
| Sitagliptin Process Impurity 5 | 767352-30-7 | Ax-IMP2329 |
| Fexofenadine EP Impurity A | 76811-98-8 | Ax-IMP817 |
| 4-Desfluoro Sitagliptin | 486460-31-5; 1345822-87-8 (salt) | Ax-IMP2328 |
| 5-Desfluoro Sitagliptin | 1345822-86-7 | Ax-IMP2330 |
| Fexofenadine EP Impurity C | 185066-37-9 | Ax-IMP818 |
| Doxepin Impurity A | 4504-87-4 | Ax-IMP2331 |
| Levetiracetam Carboxylic Acid | 102849-49-0 | Ax-IMP816 |
| Doxepin Impurity B | 4504-88-5 | Ax-IMP2332 |
| Risperidone Process Impurity 1 | 691007-05-3 | Ax-IMP815 |