| Ritlecitinib nitrosamine impurity 13 | NA | Ax-17611 |
| Ritlecitinib nitrosamine impurity 12 | NA | Ax-17610 |
| Ritlecitinib nitrosamine impurity 11 | NA | Ax-17609 |
| Ritlecitinib nitrosamine impurity 10 | NA | Ax-17608 |
| Ritlecitinib nitrosamine impurity 9 | NA | Ax-17607 |
| Ritlecitinib nitrosamine impurity 8 | NA | Ax-17606 |
| Ritlecitinib nitrosamine impurity 7 | NA | Ax-17605 |
| Ritlecitinib impurity 6 | NA | Ax-17604 |
| Ritlecitinib nitrosamine impurity 6 | NA | Ax-17603 |
| Ritlecitinib impurity 5 | NA | Ax-17602 |