| Bosentan Process Impurity 1 | NA | Ax-IMP2680 |
| Pregablin Impurity C | 90-64-2 | Ax-IMP1179 |
| Bosentan Process Impurity 2 | NA | Ax-IMP2681 |
| Bosentan Impurity 4 | NA | Ax-IMP2679 |
| Pregablin Process impurity 1 | 53618-21-6 | Ax-IMP1177 |
| Pregablin Process impurity 2 | 100401-40-9 | Ax-IMP1178 |
| 3,5-Dinitro-1H-pyrazole | 38858-89-8 | Ax-783 |
| Methyl L-homoalaninate HCl | 56545-22-3 | Ax-784 |
| Pregablin impurity A | 181289-23-6 | Ax-IMP1176 |
| 3-bromo-2-fluoropyridine | 36178-05-9 | Ax-785 |