| Ritlecitinib impurity 2 | NA | Ax-17597 |
| Ritlecitinib nitrosamine impurity 3 | NA | Ax-17596 |
| Ritlecitinib nitrosamine impurity 2 | NA | Ax-17595 |
| Ritlecitinib impurity 1 | 1227917-63-6 | Ax-17594 |
| Ritlecitinib nitrosamine impurity 1 | NA | Ax-17593 |
| Ritlecitinib Dimer | 2374827-88-8 | Ax-17592 |
| methyl 8-chloro-11-oxo-11H-benzo[5,6]cyclohepta[1,2-b]pyridine-6-carboxylate | 592554-82-0 | Ax-17553 |
| 3,8-dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-one | 183483-27-4 | Ax-17552 |
| N-Desmethyl Doxycycline | 86271-83-2 | Ax-17551 |
| N-Desmethyl N-Nitroso Methadone | NA | Ax-17550 |