| (E/Z)-3-O-Methyl Entacapone | 146698-91-1 | Ax-IMP2453 |
| (Z)-Methoxy Entacapone | 158693-04-0 | Ax-IMP2454 |
| Entacapone Impurity B | 116314-52-4 | Ax-IMP2455 |
| Entacapone EP Impurity C / RC C | 116313-85-0 | Ax-IMP2456 |
| Entacapone Impurity D | 857629-79-9 | Ax-IMP2457 |
| trans-1,4-Diaminocyclohexane | 2615-25-0 | Ax-477 |
| 5-Bromovaleryl Chloride | 4509-90-4 | Ax-479 |
| Entacapone Impurity E | 7659-29-2 | Ax-IMP2458 |
| Entacapone Impurity G | 1364322-41-7 | Ax-IMP2460 |
| Entacapone Impurity I | 1364322-42-8 | Ax-IMP2462 |