| Upadacitinib Impurity 4 | 2095311-46-7 | Ax-16491 |
| Upadacitinib Impurity 3 | 1821826-28-1 | Ax-16490 |
| Upadacitinib Impurity 2 | 1428243-24-6 | Ax-16489 |
| Upadacitinib Impurity 1 | 2050038-78-1 | Ax-16488 |
| 3-methyl-2-methylenebutanal | 4417-80-5 | Ax-16485 |
| Cladribine Impurity B | 24757-70-8 | Ax-16484 |
| 1-(dichloromethyl)-4-fluorobenzene | 456-19-9 | Ax-16547 |
| N-Nitroso Nitrofurantoin 5 | NA | Ax-16546 |
| N-Nitroso Nitrofurantoin Open Ring impurity | NA | Ax-16545 |
| N-Nitroso Nitrofurantoin 6 | NA | Ax-16544 |