| 4-Chloro-3-oxobutanoic acid | 27807-84-7 | Ax-12126 |
| 3-(3,5-Difluorophenoxyl) propane-1-ol | 1111086-20-4 | Ax-12125 |
| 3-(3,5-Difluorophenoxyl) propionic acid | 844648-19-7 | Ax-12124 |
| 2-(4-aminocyclohexyl)acetic acid | 1197-54-2 | Ax-12123 |
| 1-Nitrosopyrrolidin-2-one | 54634-49-0 | Ax-12122 |
| 2-Thia-6-Aza-Spiro[3.3]Heptane2,2-Dioxide Trifluoroacetate | 1636128-26-1 | Ax-12121 |
| Tofacitinib Nitroso Impurity 4 | NA | Ax-12120 |
| Tofacitinib Nitroso Impurity 3 | NA | Ax-12119 |
| Tofacitinib Nitroso Impurity 2 | NA | Ax-12118 |
| Tofacitinib Impurity 5 | 1527525-58-1 | Ax-12117 |