| Flecainide impurity C | 152171-74-9 | Ax-IMP338 |
| Flecainide impurity D | 35480-52-5 | Ax-IMP339 |
| Flecainide Impurity E | 57415-36-8 | Ax-IMP340 |
| Pyridostigmine Impurity B | 31034-86-3 | Ax-IMP335 |
| Pyridostigmine Impurity A | 51581-32-9 | Ax-IMP334 |
| Metformin HCl | 1115-70-4 | Ax-IMP333 |
| Metformin EP Impurity D | 108-78-1 | Ax-IMP331 |
| Metformin EP Impurity C | 1985-46-2 | Ax-IMP330 |
| Metformin EP Impurity E | 36801-25-9 | Ax-IMP332 |
| Metformin EP Impurity B | 2959-04-8 | Ax-IMP329 |