| Pirferidone Intermediate 2 | 912570-13-9 | Ax-PRD02 |
| Pirferidone Intermediate 3 | NA | Ax-PRD03 |
| Pirferidone Intermediate 4 | 912570-19-5 | Ax-PRD04 |
| Pirferidone Intermediate 5 | NA | Ax-PRD05 |
| Pirferidone Intermediate 6 | 2251047-36-4 | Ax-PRD06 |
| Pirferidone Intermediate 7 | NA | Ax-PRD07 |
| Pirferidone Intermediate 8 | 32631-59-7 | Ax-PRD08 |
| Pirferidone Intermediate 9 | 19933-06-3 | Ax-PRD09 |
| Pirferidone Intermediate 10 | 43191-22-6 | Ax-PRD10 |
| Pirferidone Intermediate 11 | 51933-81-4 | Ax-PRD11 |